diff --git a/test/built-ins/Temporal/Calendar/prototype/fields/argument-throws-duplicate-keys.js b/test/built-ins/Temporal/Calendar/prototype/fields/argument-throws-duplicate-keys.js
index f34d85f7ea3..ac6a90574d8 100644
--- a/test/built-ins/Temporal/Calendar/prototype/fields/argument-throws-duplicate-keys.js
+++ b/test/built-ins/Temporal/Calendar/prototype/fields/argument-throws-duplicate-keys.js
@@ -14,7 +14,7 @@ features: [Temporal]
 
 const calendar = new Temporal.Calendar("iso8601");
 assert.throws(RangeError, () => calendar.fields(["day", "month", "day"]));
-assert.throws(RangeError, () => calendar.fields(["year", "month", "monthCode", "day", "hour", "minute", "second", "millisecond", "microsecond", "nanosecond", "year"]));
+assert.throws(RangeError, () => calendar.fields(["year", "month", "monthCode", "day", "year"]));
 
 const manyFields = {
   count: 0
diff --git a/test/built-ins/Temporal/Calendar/prototype/fields/argument-throws-invalid-keys.js b/test/built-ins/Temporal/Calendar/prototype/fields/argument-throws-invalid-keys.js
index ec6a73b6932..8f3627af357 100644
--- a/test/built-ins/Temporal/Calendar/prototype/fields/argument-throws-invalid-keys.js
+++ b/test/built-ins/Temporal/Calendar/prototype/fields/argument-throws-invalid-keys.js
@@ -3,7 +3,9 @@
 
 /*---
 esid: sec-temporal.calendar.prototype.fields
-description: Calendar.prototype.fields rejects input field names that are not singular names of temporal units
+description: >
+  Calendar.prototype.fields rejects input field names that are not singular
+  names of Temporal date units
 info: |
     sec-temporal.calendar.prototype.fields step 7.b.ii:
       7. Repeat, while next is not false,
@@ -14,7 +16,7 @@ info: |
             1. Let completion be ThrowCompletion(a newly created TypeError object).
             2. Return ? IteratorClose(iteratorRecord, completion).
     sec-temporal.calendar.prototype.fields step 7.b.iv:
-          iv. If _nextValue_ is not one of *"year"*, *"month"*, *"monthCode"*, *"day"*, *"hour"*, *"minute"*, *"second"*, *"millisecond"*, *"microsecond"*, *"nanosecond"*, then
+          iv. If _nextValue_ is not one of *"year"*, *"month"*, *"monthCode"*, or *"day"*, then
             1. Let _completion_ be ThrowCompletion(a newly created *RangeError* object).
             2. Return ? IteratorClose(_iteratorRecord_, _completion_).
 
@@ -30,6 +32,12 @@ assert.throws(TypeError, () => calendar.fields([null]));
 assert.throws(TypeError, () => calendar.fields([{}]));
 assert.throws(TypeError, () => calendar.fields([undefined]));
 assert.throws(TypeError, () => calendar.fields(["day", 1]));
+assert.throws(RangeError, () => calendar.fields(["hour"]));
+assert.throws(RangeError, () => calendar.fields(["minute"]));
+assert.throws(RangeError, () => calendar.fields(["second"]));
+assert.throws(RangeError, () => calendar.fields(["millisecond"]));
+assert.throws(RangeError, () => calendar.fields(["microsecond"]));
+assert.throws(RangeError, () => calendar.fields(["nanosecond"]));
 assert.throws(RangeError, () => calendar.fields(["month", "days"]));
 assert.throws(RangeError, () => calendar.fields(["days"]));
 assert.throws(RangeError, () => calendar.fields(["people"]));
diff --git a/test/built-ins/Temporal/Calendar/prototype/fields/long-input.js b/test/built-ins/Temporal/Calendar/prototype/fields/long-input.js
index 9ed52dc9f71..6e8b32ed7b8 100644
--- a/test/built-ins/Temporal/Calendar/prototype/fields/long-input.js
+++ b/test/built-ins/Temporal/Calendar/prototype/fields/long-input.js
@@ -17,7 +17,7 @@ info: |
   a. Set next to ? IteratorStep(iteratorRecord).
   b. If next is not false, then
   i. Let nextValue be ? IteratorValue(next).
-  iv. If nextValue is not one of "year", "month", "monthCode", "day", "hour", "minute", "second", "millisecond", "microsecond", "nanosecond", then
+  iv. If nextValue is not one of "year", "month", "monthCode", or "day", then
   1. Let completion be ThrowCompletion(a newly created RangeError object).
   2. Return ? IteratorClose(iteratorRecord, completion).
 features: [Symbol, Symbol.iterator, Temporal, computed-property-names, generators]
@@ -38,7 +38,7 @@ const fields = {
       // The following three lines should not be reached if the implemention
       // correctly check the previous line.
       i++;
-      yield "hour";
+      yield "day";
       i++;
   }
 }
diff --git a/test/built-ins/Temporal/Calendar/prototype/fields/repeated-throw.js b/test/built-ins/Temporal/Calendar/prototype/fields/repeated-throw.js
index 97d9ba22d4d..2d82b084238 100644
--- a/test/built-ins/Temporal/Calendar/prototype/fields/repeated-throw.js
+++ b/test/built-ins/Temporal/Calendar/prototype/fields/repeated-throw.js
@@ -4,7 +4,7 @@
 /*---
 esid: sec-temporal.calendar.prototype.fields
 description: >
-  Temporal.Calendar.prototype.fields will throw if its input iterable yields 
+  Temporal.Calendar.prototype.fields will throw if its input iterable yields
   the same value twice.
 info: |
   ## 12.4.21 Temporal.Calendar.prototype.fields ( fields )
@@ -38,9 +38,8 @@ assert.throws(
     RangeError, () => cal.fields(fields), "repeated valid value should throw");
 assert.sameValue(i, 2, "Should stop at 2");
 
-// Test all valid value will throw while repeate
-[ "nanosecond", "microsecond", "millisecond", "second",
-  "minute", "hour", "day", "monthCode", "month", "year" ].forEach((f) => {
+// Test all valid values will throw when repeated
+[ "day", "monthCode", "month", "year" ].forEach((f) => {
   i = 0;
   const fields2 = {
     *[Symbol.iterator]() {
diff --git a/test/built-ins/Temporal/Calendar/prototype/fields/reverse.js b/test/built-ins/Temporal/Calendar/prototype/fields/reverse.js
index e0e099ac8c0..76035475f61 100644
--- a/test/built-ins/Temporal/Calendar/prototype/fields/reverse.js
+++ b/test/built-ins/Temporal/Calendar/prototype/fields/reverse.js
@@ -17,7 +17,7 @@ info: |
   a. Set next to ? IteratorStep(iteratorRecord).
   b. If next is not false, then
   i. Let nextValue be ? IteratorValue(next).
-  iv. If nextValue is not one of "year", "month", "monthCode", "day", "hour", "minute", "second", "millisecond", "microsecond", "nanosecond", then
+  iv. If nextValue is not one of "year", "month", "monthCode", or "day", then
   1. Let completion be ThrowCompletion(a newly created RangeError object).
   2. Return ? IteratorClose(iteratorRecord, completion).
 features: [Symbol, Symbol.iterator, Temporal, computed-property-names, generators]
@@ -26,12 +26,6 @@ includes: [compareArray.js]
 let cal = new Temporal.Calendar("iso8601")
 const fields = {
   *[Symbol.iterator]() {
-     yield "nanosecond";
-     yield "microsecond";
-     yield "millisecond";
-     yield "second";
-     yield "minute";
-     yield "hour";
      yield "day";
      yield "monthCode";
      yield "month";
diff --git a/test/built-ins/Temporal/Duration/compare/calendar-fields-iterable.js b/test/built-ins/Temporal/Duration/compare/calendar-fields-iterable.js
index 3f30596d1eb..5beaa79ee93 100644
--- a/test/built-ins/Temporal/Duration/compare/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/Duration/compare/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/Duration/prototype/add/calendar-fields-iterable.js b/test/built-ins/Temporal/Duration/prototype/add/calendar-fields-iterable.js
index edb6e594c00..91309aa2a1f 100644
--- a/test/built-ins/Temporal/Duration/prototype/add/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/Duration/prototype/add/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/Duration/prototype/round/calendar-fields-iterable.js b/test/built-ins/Temporal/Duration/prototype/round/calendar-fields-iterable.js
index 5210c821fe8..3703596d710 100644
--- a/test/built-ins/Temporal/Duration/prototype/round/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/Duration/prototype/round/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/Duration/prototype/subtract/calendar-fields-iterable.js b/test/built-ins/Temporal/Duration/prototype/subtract/calendar-fields-iterable.js
index 07e590723b5..b9d887416ff 100644
--- a/test/built-ins/Temporal/Duration/prototype/subtract/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/Duration/prototype/subtract/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/Duration/prototype/total/calendar-fields-iterable.js b/test/built-ins/Temporal/Duration/prototype/total/calendar-fields-iterable.js
index 99754046d35..0bd730fca5a 100644
--- a/test/built-ins/Temporal/Duration/prototype/total/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/Duration/prototype/total/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/Instant/prototype/toString/order-of-operations.js b/test/built-ins/Temporal/Instant/prototype/toString/order-of-operations.js
index 0c4e27bc033..238869e55c1 100644
--- a/test/built-ins/Temporal/Instant/prototype/toString/order-of-operations.js
+++ b/test/built-ins/Temporal/Instant/prototype/toString/order-of-operations.js
@@ -24,8 +24,6 @@ const expected = [
   "has options.timeZone.id",
   "get options.timeZone.getOffsetNanosecondsFor",
   "call options.timeZone.getOffsetNanosecondsFor",
-  "get options.timeZone.getOffsetNanosecondsFor",
-  "call options.timeZone.getOffsetNanosecondsFor",
 ];
 const actual = [];
 
diff --git a/test/built-ins/Temporal/Instant/prototype/toString/timezone.js b/test/built-ins/Temporal/Instant/prototype/toString/timezone.js
index 3a573541656..74edc124c62 100644
--- a/test/built-ins/Temporal/Instant/prototype/toString/timezone.js
+++ b/test/built-ins/Temporal/Instant/prototype/toString/timezone.js
@@ -3,7 +3,8 @@
 
 /*---
 esid: sec-temporal.instant.prototype.tostring
-description: Passing a TimeZone to options calls getOffsetNanosecondsFor twice, but not toString
+description: >
+  Passing a TimeZone to options calls getOffsetNanosecondsFor, but not toString
 includes: [compareArray.js, temporalHelpers.js]
 features: [Temporal]
 ---*/
@@ -15,8 +16,6 @@ const expected = [
   "has timeZone.id",
   "get timeZone.getOffsetNanosecondsFor",
   "call timeZone.getOffsetNanosecondsFor",
-  "get timeZone.getOffsetNanosecondsFor",
-  "call timeZone.getOffsetNanosecondsFor",
 ];
 
 const instant = Temporal.Instant.from("1975-02-02T14:25:36.123456Z");
diff --git a/test/built-ins/Temporal/PlainDate/from/observable-get-overflow-argument-primitive.js b/test/built-ins/Temporal/PlainDate/from/observable-get-overflow-argument-primitive.js
new file mode 100644
index 00000000000..e1dcc6795f6
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/from/observable-get-overflow-argument-primitive.js
@@ -0,0 +1,34 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.from
+description: overflow property is extracted with string argument.
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "get options.overflow.toString",
+  "call options.overflow.toString",
+];
+
+let actual = [];
+const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+
+const result = Temporal.PlainDate.from("2021-05-17", options);
+assert.compareArray(actual, expected, "Successful call");
+TemporalHelpers.assertPlainDate(result, 2021, 5, "M05", 17);
+
+actual.splice(0);  // empty it for the next check
+const failureExpected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+];
+
+assert.throws(TypeError, () => Temporal.PlainDate.from(7, options));
+assert.compareArray(actual, failureExpected, "Failing call");
diff --git a/test/built-ins/Temporal/PlainDate/from/observable-get-overflow-argument-string-invalid.js b/test/built-ins/Temporal/PlainDate/from/observable-get-overflow-argument-string-invalid.js
index f0dee3ade9c..f3789e814d3 100644
--- a/test/built-ins/Temporal/PlainDate/from/observable-get-overflow-argument-string-invalid.js
+++ b/test/built-ins/Temporal/PlainDate/from/observable-get-overflow-argument-string-invalid.js
@@ -4,27 +4,18 @@
 /*---
 esid: sec-temporal.plaindate.from
 description: overflow property is extracted with ISO-invalid string argument.
-info: |
-    1. Perform ? ToTemporalOverflow(_options_).
-
-    1. If ! IsValidISODate(year, month, day) is false, throw a RangeError exception.
 includes: [compareArray.js, temporalHelpers.js]
 features: [Temporal]
 ---*/
 
 const expected = [
-  "get overflow",
-  "get overflow.toString",
-  "call overflow.toString",
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
 ];
 
 let actual = [];
-const object = {
-  get overflow() {
-    actual.push("get overflow");
-    return TemporalHelpers.toPrimitiveObserver(actual, "constrain", "overflow");
-  }
-};
+const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
 
-assert.throws(RangeError, () => Temporal.PlainDate.from("2020-13-34", object));
+assert.throws(RangeError, () => Temporal.PlainDate.from("2020-13-34", options));
 assert.compareArray(actual, expected);
diff --git a/test/built-ins/Temporal/PlainDate/from/observable-get-overflow-argument-string.js b/test/built-ins/Temporal/PlainDate/from/observable-get-overflow-argument-string.js
deleted file mode 100644
index c4f6599b6c5..00000000000
--- a/test/built-ins/Temporal/PlainDate/from/observable-get-overflow-argument-string.js
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright (C) 2021 Igalia, S.L. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-esid: sec-temporal.plaindate.from
-description: overflow property is extracted with string argument.
-info: |
-    1. Perform ? ToTemporalOverflow(_options_).
-includes: [compareArray.js, temporalHelpers.js]
-features: [Temporal]
----*/
-
-const expected = [
-  "get overflow",
-  "get overflow.toString",
-  "call overflow.toString",
-];
-
-let actual = [];
-const object = {
-  get overflow() {
-    actual.push("get overflow");
-    return TemporalHelpers.toPrimitiveObserver(actual, "reject", "overflow");
-  }
-};
-
-const result = Temporal.PlainDate.from("2021-05-17", object);
-assert.compareArray(actual, expected, "Successful call");
-TemporalHelpers.assertPlainDate(result, 2021, 5, "M05", 17);
-
-actual.splice(0);  // empty it for the next check
-assert.throws(TypeError, () => Temporal.PlainDate.from(7, object));
-assert.compareArray(actual, expected, "Failing call");
diff --git a/test/built-ins/Temporal/PlainDate/from/order-of-operations.js b/test/built-ins/Temporal/PlainDate/from/order-of-operations.js
index e0f621e891b..05896453a65 100644
--- a/test/built-ins/Temporal/PlainDate/from/order-of-operations.js
+++ b/test/built-ins/Temporal/PlainDate/from/order-of-operations.js
@@ -9,6 +9,11 @@ features: [Temporal]
 ---*/
 
 const expected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "getOwnPropertyDescriptor options.extra",
+  "get options.extra",
   "get fields.calendar",
   "has fields.calendar.dateAdd",
   "has fields.calendar.dateFromFields",
@@ -48,7 +53,6 @@ const expected = [
   "get fields.calendar.dateFromFields",
   "call fields.calendar.dateFromFields",
   // inside Calendar.p.dateFromFields
-  "get options.overflow",
   "get options.overflow.toString",
   "call options.overflow.toString",
 ];
@@ -63,7 +67,10 @@ const fields = TemporalHelpers.propertyBagObserver(actual, {
   calendar,
 }, "fields");
 
-const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+const options = TemporalHelpers.propertyBagObserver(actual, {
+  overflow: "constrain",
+  extra: "property",
+}, "options");
 
 const result = Temporal.PlainDate.from(fields, options);
 assert.compareArray(actual, expected, "order of operations");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/with/custom.js b/test/built-ins/Temporal/PlainDate/prototype/with/custom.js
index 46ecc26d4ca..16109882870 100644
--- a/test/built-ins/Temporal/PlainDate/prototype/with/custom.js
+++ b/test/built-ins/Temporal/PlainDate/prototype/with/custom.js
@@ -8,7 +8,9 @@ features: [Temporal]
 ---*/
 
 const result = new Temporal.PlainDate(1920, 5, 3);
-const options = {};
+const options = {
+  extra: "property",
+};
 let calls = 0;
 class CustomCalendar extends Temporal.Calendar {
   constructor() {
@@ -22,7 +24,9 @@ class CustomCalendar extends Temporal.Calendar {
     assert.sameValue(args[0].month, 11, "First argument: month");
     assert.sameValue(args[0].monthCode, "M11", "First argument: monthCode");
     assert.sameValue(args[0].year, 43, "First argument: year");
-    assert.sameValue(args[1], options, "Second argument");
+    assert.notSameValue(args[1], options, "Second argument is a copy of options");
+    assert.sameValue(args[1].extra, "property", "All properties are copied");
+    assert.sameValue(Object.getPrototypeOf(args[1]), null, "Copy has null prototype");
     return result;
   }
 }
diff --git a/test/built-ins/Temporal/PlainDate/prototype/with/order-of-operations.js b/test/built-ins/Temporal/PlainDate/prototype/with/order-of-operations.js
index 8ad2e977468..5924aff9bdf 100644
--- a/test/built-ins/Temporal/PlainDate/prototype/with/order-of-operations.js
+++ b/test/built-ins/Temporal/PlainDate/prototype/with/order-of-operations.js
@@ -12,6 +12,12 @@ const expected = [
   // RejectObjectWithCalendarOrTimeZone
   "get fields.calendar",
   "get fields.timeZone",
+  // CopyDataProperties
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "getOwnPropertyDescriptor options.extra",
+  "get options.extra",
   // CalendarFields
   "get this.calendar.fields",
   "call this.calendar.fields",
@@ -44,7 +50,6 @@ const expected = [
   "get this.calendar.dateFromFields",
   "call this.calendar.dateFromFields",
   // inside Calendar.p.dateFromFields
-  "get options.overflow",
   "get options.overflow.toString",
   "call options.overflow.toString",
 ];
@@ -64,6 +69,7 @@ const fields = TemporalHelpers.propertyBagObserver(actual, {
 
 const options = TemporalHelpers.propertyBagObserver(actual, {
   overflow: "constrain",
+  extra: "property",
 }, "options");
 
 instance.with(fields, options);
diff --git a/test/built-ins/Temporal/PlainDateTime/compare/calendar-fields-iterable.js b/test/built-ins/Temporal/PlainDateTime/compare/calendar-fields-iterable.js
index 6ff46e0b12e..e18745c3533 100644
--- a/test/built-ins/Temporal/PlainDateTime/compare/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/PlainDateTime/compare/calendar-fields-iterable.js
@@ -18,14 +18,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/PlainDateTime/from/calendar-fields-iterable.js b/test/built-ins/Temporal/PlainDateTime/from/calendar-fields-iterable.js
index 318c0561a1e..d2e5ae473fb 100644
--- a/test/built-ins/Temporal/PlainDateTime/from/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/PlainDateTime/from/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/PlainDateTime/from/observable-get-overflow-argument-primitive.js b/test/built-ins/Temporal/PlainDateTime/from/observable-get-overflow-argument-primitive.js
new file mode 100644
index 00000000000..babe403a9cd
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/from/observable-get-overflow-argument-primitive.js
@@ -0,0 +1,34 @@
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.from
+description: overflow property is extracted with string argument.
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "get options.overflow.toString",
+  "call options.overflow.toString",
+];
+
+let actual = [];
+const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "reject" }, "options");
+
+const result = Temporal.PlainDateTime.from("2021-05-17T12:34:56", options);
+assert.compareArray(actual, expected, "Successful call");
+TemporalHelpers.assertPlainDateTime(result, 2021, 5, "M05", 17, 12, 34, 56, 0, 0, 0);
+
+actual.splice(0);  // empty it for the next check
+const failureExpected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+];
+
+assert.throws(TypeError, () => Temporal.PlainDateTime.from(7, options));
+assert.compareArray(actual, failureExpected, "Failing call");
diff --git a/test/built-ins/Temporal/PlainDateTime/from/observable-get-overflow-argument-string-invalid.js b/test/built-ins/Temporal/PlainDateTime/from/observable-get-overflow-argument-string-invalid.js
new file mode 100644
index 00000000000..9eff4e745b5
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/from/observable-get-overflow-argument-string-invalid.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.from
+description: overflow property is extracted with ISO-invalid string argument.
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+];
+
+let actual = [];
+const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "reject" }, "options");
+
+assert.throws(RangeError, () => Temporal.PlainDateTime.from("2020-13-34T25:60:60", options));
+assert.compareArray(actual, expected);
diff --git a/test/built-ins/Temporal/PlainDateTime/from/order-of-operations.js b/test/built-ins/Temporal/PlainDateTime/from/order-of-operations.js
index ad11f628b94..ba5123b1d2b 100644
--- a/test/built-ins/Temporal/PlainDateTime/from/order-of-operations.js
+++ b/test/built-ins/Temporal/PlainDateTime/from/order-of-operations.js
@@ -9,6 +9,12 @@ features: [Temporal]
 ---*/
 
 const expected = [
+  // CopyDataProperties
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "getOwnPropertyDescriptor options.extra",
+  "get options.extra",
   // GetTemporalCalendarSlotValueWithISODefault
   "get fields.calendar",
   "has fields.calendar.dateAdd",
@@ -67,15 +73,10 @@ const expected = [
   "get fields.year.valueOf",
   "call fields.year.valueOf",
   // InterpretTemporalDateTimeFields
-  "get options.overflow",
   "get options.overflow.toString",
   "call options.overflow.toString",
   "get fields.calendar.dateFromFields",
   "call fields.calendar.dateFromFields",
-  // inside Calendar.p.dateFromFields
-  "get options.overflow",
-  "get options.overflow.toString",
-  "call options.overflow.toString",
 ];
 const actual = [];
 
@@ -93,7 +94,10 @@ const fields = TemporalHelpers.propertyBagObserver(actual, {
   calendar: TemporalHelpers.calendarObserver(actual, "fields.calendar"),
 }, "fields");
 
-const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+const options = TemporalHelpers.propertyBagObserver(actual, {
+  overflow: "constrain",
+  extra: "property",
+}, "options");
 
 Temporal.PlainDateTime.from(fields, options);
 assert.compareArray(actual, expected, "order of operations");
diff --git a/test/built-ins/Temporal/PlainDateTime/from/overflow-wrong-type.js b/test/built-ins/Temporal/PlainDateTime/from/overflow-wrong-type.js
index 150c22f8cdd..5da8062c25a 100644
--- a/test/built-ins/Temporal/PlainDateTime/from/overflow-wrong-type.js
+++ b/test/built-ins/Temporal/PlainDateTime/from/overflow-wrong-type.js
@@ -48,14 +48,12 @@ assert.throws(RangeError, () => Temporal.PlainDateTime.from(propertyBag, { overf
 assert.throws(RangeError, () => Temporal.PlainDateTime.from(propertyBag, { overflow: 2n }), "bigint");
 assert.throws(RangeError, () => Temporal.PlainDateTime.from(propertyBag, { overflow: {} }), "plain object");
 
-// toString property is read once by Calendar.dateFromFields() in the builtin
-// calendars, to get the option value for the date part, and then once again
-// internally to get the option value for the time part.
+// toString property should only be read and converted to a string once, because
+// a copied object with the resulting string on it is passed to
+// Calendar.dateFromFields().
 const expected = [
   "get overflow.toString",
   "call overflow.toString",
-  "get overflow.toString",
-  "call overflow.toString",
 ];
 const actual = [];
 const observer = TemporalHelpers.toPrimitiveObserver(actual, "constrain", "overflow");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/equals/calendar-fields-iterable.js b/test/built-ins/Temporal/PlainDateTime/prototype/equals/calendar-fields-iterable.js
index 2dd05536938..58a0aeccc9c 100644
--- a/test/built-ins/Temporal/PlainDateTime/prototype/equals/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/equals/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/since/calendar-fields-iterable.js b/test/built-ins/Temporal/PlainDateTime/prototype/since/calendar-fields-iterable.js
index 1a6308d8416..18c2c6b911f 100644
--- a/test/built-ins/Temporal/PlainDateTime/prototype/since/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/since/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/until/calendar-fields-iterable.js b/test/built-ins/Temporal/PlainDateTime/prototype/until/calendar-fields-iterable.js
index cbad88be3f2..a65bc99b1dd 100644
--- a/test/built-ins/Temporal/PlainDateTime/prototype/until/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/until/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/with/calendar-fields-iterable.js b/test/built-ins/Temporal/PlainDateTime/prototype/with/calendar-fields-iterable.js
index 1fd4c0a531e..b509cd42736 100644
--- a/test/built-ins/Temporal/PlainDateTime/prototype/with/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/with/calendar-fields-iterable.js
@@ -6,7 +6,7 @@ esid: sec-temporal.plaindatetime.prototype.with
 description: Verify the result of calendar.fields() is treated correctly.
 info: |
     sec-temporal.plaindatetime.prototype.with step 9:
-      9. Let _fieldNames_ be ? CalendarFields(_calendar_, « *"day"*, *"hour"*, *"microsecond"*, *"millisecond"*, *"minute"*, *"month"*, *"monthCode"*, *"nanosecond"*, *"second"*, *"year"* »).
+      9. Let _fieldNames_ be ? CalendarFields(_calendar_, « *"day"*, *"month"*, *"monthCode"*, *"year"* »).
     sec-temporal-calendarfields step 4:
       4. Let _result_ be ? IterableToList(_fieldsArray_).
 includes: [compareArray.js, temporalHelpers.js]
@@ -15,14 +15,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/with/calendar-options.js b/test/built-ins/Temporal/PlainDateTime/prototype/with/calendar-options.js
index 935c1333d12..69a22591fae 100644
--- a/test/built-ins/Temporal/PlainDateTime/prototype/with/calendar-options.js
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/with/calendar-options.js
@@ -3,12 +3,16 @@
 
 /*---
 esid: sec-temporal.plaindatetime.prototype.with
-description: The options argument is passed through to Calendar#dateFromFields as-is.
+description: >
+  The options argument is copied and the copy is passed to
+  Calendar#dateFromFields.
 includes: [temporalHelpers.js]
 features: [Temporal]
 ---*/
 
-const options = {};
+const options = {
+  extra: "property",
+};
 let calledDateFromFields = 0;
 class Calendar extends Temporal.Calendar {
   constructor() {
@@ -16,7 +20,9 @@ class Calendar extends Temporal.Calendar {
   }
   dateFromFields(fields, optionsArg) {
     ++calledDateFromFields;
-    assert.sameValue(optionsArg, options, "should pass options object through");
+    assert.notSameValue(optionsArg, options, "should pass copied options object");
+    assert.sameValue(optionsArg.extra, "property", "should copy all properties from options object");
+    assert.sameValue(Object.getPrototypeOf(optionsArg), null, "Copy has null prototype");
     return super.dateFromFields(fields, optionsArg);
   }
 };
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/with/order-of-operations.js b/test/built-ins/Temporal/PlainDateTime/prototype/with/order-of-operations.js
index 3d2e6afef28..bd98fe55a17 100644
--- a/test/built-ins/Temporal/PlainDateTime/prototype/with/order-of-operations.js
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/with/order-of-operations.js
@@ -12,22 +12,22 @@ const expected = [
   // RejectObjectWithCalendarOrTimeZone
   "get fields.calendar",
   "get fields.timeZone",
+  // CopyDataProperties
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "getOwnPropertyDescriptor options.extra",
+  "get options.extra",
   // CalendarFields
   "get this.calendar.fields",
   "call this.calendar.fields",
   // PrepareTemporalFields on receiver
   "get this.calendar.day",
   "call this.calendar.day",
-  "get this.hour",
-  "get this.microsecond",
-  "get this.millisecond",
-  "get this.minute",
   "get this.calendar.month",
   "call this.calendar.month",
   "get this.calendar.monthCode",
   "call this.calendar.monthCode",
-  "get this.nanosecond",
-  "get this.second",
   "get this.calendar.year",
   "call this.calendar.year",
   // PrepareTemporalFields on argument
@@ -65,15 +65,10 @@ const expected = [
   "get this.calendar.mergeFields",
   "call this.calendar.mergeFields",
   // InterpretTemporalDateTimeFields
-  "get options.overflow",
   "get options.overflow.toString",
   "call options.overflow.toString",
   "get this.calendar.dateFromFields",
   "call this.calendar.dateFromFields",
-  // inside Calendar.p.dateFromFields
-  "get options.overflow",
-  "get options.overflow.toString",
-  "call options.overflow.toString",
 ];
 const actual = [];
 
@@ -102,7 +97,10 @@ const fields = TemporalHelpers.propertyBagObserver(actual, {
   nanosecond: 1.7,
 }, "fields");
 
-const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+const options = TemporalHelpers.propertyBagObserver(actual, {
+  overflow: "constrain",
+  extra: "property",
+}, "options");
 
 instance.with(fields, options);
 assert.compareArray(actual, expected, "order of operations");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/with/overflow-wrong-type.js b/test/built-ins/Temporal/PlainDateTime/prototype/with/overflow-wrong-type.js
index 75f6fe0aae2..081c4ba8980 100644
--- a/test/built-ins/Temporal/PlainDateTime/prototype/with/overflow-wrong-type.js
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/with/overflow-wrong-type.js
@@ -31,14 +31,12 @@ assert.throws(RangeError, () => datetime.with({ minute: 45 }, { overflow: 2 }),
 assert.throws(RangeError, () => datetime.with({ minute: 45 }, { overflow: 2n }), "bigint");
 assert.throws(RangeError, () => datetime.with({ minute: 45 }, { overflow: {} }), "plain object");
 
-// toString property is read once by Calendar.dateFromFields() in the builtin
-// calendars, to get the option value for the date part, and then once again
-// internally to get the option value for the time part.
+// toString property should only be read and converted to a string once, because
+// a copied object with the resulting string on it is passed to
+// Calendar.dateFromFields().
 const expected = [
   "get overflow.toString",
   "call overflow.toString",
-  "get overflow.toString",
-  "call overflow.toString",
 ];
 const actual = [];
 const observer = TemporalHelpers.toPrimitiveObserver(actual, "constrain", "overflow");
diff --git a/test/built-ins/Temporal/PlainMonthDay/from/observable-get-overflow-argument-primitive.js b/test/built-ins/Temporal/PlainMonthDay/from/observable-get-overflow-argument-primitive.js
new file mode 100644
index 00000000000..2dedb669b4c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/from/observable-get-overflow-argument-primitive.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.from
+description: overflow property is extracted with string argument.
+info: |
+    1. Perform ? ToTemporalOverflow(_options_).
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "get options.overflow.toString",
+  "call options.overflow.toString",
+];
+
+let actual = [];
+const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+
+const result = Temporal.PlainMonthDay.from("05-17", options);
+assert.compareArray(actual, expected, "Successful call");
+TemporalHelpers.assertPlainMonthDay(result, "M05", 17);
+
+actual.splice(0);  // empty it for the next check
+const failureExpected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+];
+
+assert.throws(TypeError, () => Temporal.PlainMonthDay.from(7, options));
+assert.compareArray(actual, failureExpected, "Failing call");
diff --git a/test/built-ins/Temporal/PlainMonthDay/from/observable-get-overflow-argument-string-invalid.js b/test/built-ins/Temporal/PlainMonthDay/from/observable-get-overflow-argument-string-invalid.js
new file mode 100644
index 00000000000..297ea0dfd3f
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/from/observable-get-overflow-argument-string-invalid.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.from
+description: overflow property is extracted with ISO-invalid string argument.
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+];
+
+let actual = [];
+const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+
+assert.throws(RangeError, () => Temporal.PlainMonthDay.from("13-34", options));
+assert.compareArray(actual, expected);
diff --git a/test/built-ins/Temporal/PlainMonthDay/from/order-of-operations.js b/test/built-ins/Temporal/PlainMonthDay/from/order-of-operations.js
index 043b3461ceb..47a4d6d17e6 100644
--- a/test/built-ins/Temporal/PlainMonthDay/from/order-of-operations.js
+++ b/test/built-ins/Temporal/PlainMonthDay/from/order-of-operations.js
@@ -9,6 +9,12 @@ features: [Temporal]
 ---*/
 
 const expected = [
+  // CopyDataProperties
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "getOwnPropertyDescriptor options.extra",
+  "get options.extra",
   "get fields.calendar",
   "has fields.calendar.dateAdd",
   "has fields.calendar.dateFromFields",
@@ -51,7 +57,6 @@ const expected = [
   "get fields.calendar.monthDayFromFields",
   "call fields.calendar.monthDayFromFields",
   // inside Calendar.p.monthDayFromFields
-  "get options.overflow",
   "get options.overflow.toString",
   "call options.overflow.toString",
 ];
@@ -65,7 +70,10 @@ const fields = TemporalHelpers.propertyBagObserver(actual, {
   calendar: TemporalHelpers.calendarObserver(actual, "fields.calendar"),
 }, "fields");
 
-const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+const options = TemporalHelpers.propertyBagObserver(actual, {
+  overflow: "constrain",
+  extra: "property",
+}, "options");
 
 Temporal.PlainMonthDay.from(fields, options);
 assert.compareArray(actual, expected, "order of operations");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/with/calendar-arguments.js b/test/built-ins/Temporal/PlainMonthDay/prototype/with/calendar-arguments.js
index aee39245f96..0878abeb1cb 100644
--- a/test/built-ins/Temporal/PlainMonthDay/prototype/with/calendar-arguments.js
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/with/calendar-arguments.js
@@ -12,7 +12,9 @@ includes: [temporalHelpers.js]
 features: [Temporal]
 ---*/
 
-const options = {};
+const options = {
+  extra: "property",
+};
 class CustomCalendar extends Temporal.Calendar {
   constructor() {
     super("iso8601");
@@ -20,7 +22,9 @@ class CustomCalendar extends Temporal.Calendar {
   monthDayFromFields(...args) {
     assert.sameValue(args.length, 2, "args.length");
     assert.sameValue(typeof args[0], "object", "args[0]");
-    assert.sameValue(args[1], options, "args[1]");
+    assert.notSameValue(args[1], options, "args[1] is a copy of options");
+    assert.sameValue(args[1].extra, "property", "All properties are copied");
+    assert.sameValue(Object.getPrototypeOf(args[1]), null, "Copy has null prototype");
     return super.monthDayFromFields(...args);
   }
 }
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/with/order-of-operations.js b/test/built-ins/Temporal/PlainMonthDay/prototype/with/order-of-operations.js
index de51a90109e..06e6d712071 100644
--- a/test/built-ins/Temporal/PlainMonthDay/prototype/with/order-of-operations.js
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/with/order-of-operations.js
@@ -12,6 +12,12 @@ const expected = [
   // RejectObjectWithCalendarOrTimeZone
   "get fields.calendar",
   "get fields.timeZone",
+  // CopyDataProperties
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "getOwnPropertyDescriptor options.extra",
+  "get options.extra",
   // CalendarFields
   "get this.calendar.fields",
   "call this.calendar.fields",
@@ -40,7 +46,6 @@ const expected = [
   "get this.calendar.monthDayFromFields",
   "call this.calendar.monthDayFromFields",
   // inside Calendar.p.monthDayFromFields
-  "get options.overflow",
   "get options.overflow.toString",
   "call options.overflow.toString",
 ];
@@ -58,7 +63,10 @@ const fields = TemporalHelpers.propertyBagObserver(actual, {
   day: 1.7,
 }, "fields");
 
-const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+const options = TemporalHelpers.propertyBagObserver(actual, {
+  overflow: "constrain",
+  extra: "property",
+}, "options");
 
 instance.with(fields, options);
 assert.compareArray(actual, expected, "order of operations");
diff --git a/test/built-ins/Temporal/PlainYearMonth/from/observable-get-overflow-argument-primitive.js b/test/built-ins/Temporal/PlainYearMonth/from/observable-get-overflow-argument-primitive.js
new file mode 100644
index 00000000000..66eeb90b341
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/from/observable-get-overflow-argument-primitive.js
@@ -0,0 +1,34 @@
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.from
+description: overflow property is extracted with string argument.
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "get options.overflow.toString",
+  "call options.overflow.toString",
+];
+
+let actual = [];
+const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+
+const result = Temporal.PlainYearMonth.from("2021-05", options);
+assert.compareArray(actual, expected, "Successful call");
+TemporalHelpers.assertPlainYearMonth(result, 2021, 5, "M05");
+
+actual.splice(0);  // empty it for the next check
+const failureExpected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+];
+
+assert.throws(TypeError, () => Temporal.PlainYearMonth.from(7, options));
+assert.compareArray(actual, failureExpected, "Failing call");
diff --git a/test/built-ins/Temporal/PlainYearMonth/from/observable-get-overflow-argument-string-invalid.js b/test/built-ins/Temporal/PlainYearMonth/from/observable-get-overflow-argument-string-invalid.js
new file mode 100644
index 00000000000..7fa6807b3ec
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/from/observable-get-overflow-argument-string-invalid.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.from
+description: overflow property is extracted with ISO-invalid string argument.
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+];
+
+let actual = [];
+const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+
+assert.throws(RangeError, () => Temporal.PlainYearMonth.from("2020-13", options));
+assert.compareArray(actual, expected);
diff --git a/test/built-ins/Temporal/PlainYearMonth/from/order-of-operations.js b/test/built-ins/Temporal/PlainYearMonth/from/order-of-operations.js
index a641a5786cf..a437d1af8cc 100644
--- a/test/built-ins/Temporal/PlainYearMonth/from/order-of-operations.js
+++ b/test/built-ins/Temporal/PlainYearMonth/from/order-of-operations.js
@@ -9,6 +9,12 @@ features: [Temporal]
 ---*/
 
 const expected = [
+  // CopyDataProperties
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "getOwnPropertyDescriptor options.extra",
+  "get options.extra",
   // GetTemporalCalendarSlotValueWithISODefault
   "get fields.calendar",
   "has fields.calendar.dateAdd",
@@ -49,7 +55,6 @@ const expected = [
   "get fields.calendar.yearMonthFromFields",
   "call fields.calendar.yearMonthFromFields",
   // inside Calendar.p.yearMonthFromFields
-  "get options.overflow",
   "get options.overflow.toString",
   "call options.overflow.toString",
 ];
@@ -62,7 +67,10 @@ const fields = TemporalHelpers.propertyBagObserver(actual, {
   calendar: TemporalHelpers.calendarObserver(actual, "fields.calendar"),
 }, "fields");
 
-const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+const options = TemporalHelpers.propertyBagObserver(actual, {
+  overflow: "constrain",
+  extra: "property",
+}, "options");
 
 Temporal.PlainYearMonth.from(fields, options);
 assert.compareArray(actual, expected, "order of operations");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/with/calendar-arguments.js b/test/built-ins/Temporal/PlainYearMonth/prototype/with/calendar-arguments.js
index 88332be0d18..9ec110eeaeb 100644
--- a/test/built-ins/Temporal/PlainYearMonth/prototype/with/calendar-arguments.js
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/with/calendar-arguments.js
@@ -12,7 +12,9 @@ includes: [temporalHelpers.js]
 features: [Temporal]
 ---*/
 
-const options = {};
+const options = {
+  extra: "property",
+};
 class CustomCalendar extends Temporal.Calendar {
   constructor() {
     super("iso8601");
@@ -20,7 +22,9 @@ class CustomCalendar extends Temporal.Calendar {
   yearMonthFromFields(...args) {
     assert.sameValue(args.length, 2, "args.length");
     assert.sameValue(typeof args[0], "object", "args[0]");
-    assert.sameValue(args[1], options, "args[1]");
+    assert.notSameValue(args[1], options, "args[1] is a copy of options");
+    assert.sameValue(args[1].extra, "property", "All properties are copied");
+    assert.sameValue(Object.getPrototypeOf(args[1]), null, "Copy has null prototype");
     return super.yearMonthFromFields(...args);
   }
 }
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/with/order-of-operations.js b/test/built-ins/Temporal/PlainYearMonth/prototype/with/order-of-operations.js
index c6980bd375c..8fc854d1604 100644
--- a/test/built-ins/Temporal/PlainYearMonth/prototype/with/order-of-operations.js
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/with/order-of-operations.js
@@ -12,6 +12,12 @@ const expected = [
   // RejectObjectWithCalendarOrTimeZone
   "get fields.calendar",
   "get fields.timeZone",
+  // CopyDataProperties
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "getOwnPropertyDescriptor options.extra",
+  "get options.extra",
   // CalendarFields
   "get this.calendar.fields",
   "call this.calendar.fields",
@@ -39,7 +45,6 @@ const expected = [
   "get this.calendar.yearMonthFromFields",
   "call this.calendar.yearMonthFromFields",
   // inside Calendar.p.yearMonthFromFields
-  "get options.overflow",
   "get options.overflow.toString",
   "call options.overflow.toString",
 ];
@@ -56,7 +61,10 @@ const fields = TemporalHelpers.propertyBagObserver(actual, {
   monthCode: "M01",
 }, "fields");
 
-const options = TemporalHelpers.propertyBagObserver(actual, { overflow: "constrain" }, "options");
+const options = TemporalHelpers.propertyBagObserver(actual, {
+  overflow: "constrain",
+  extra: "property",
+}, "options");
 
 instance.with(fields, options);
 assert.compareArray(actual, expected, "order of operations");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/calendar-fields-iterable.js b/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/calendar-fields-iterable.js
index 240e42c2a99..7686aaad94e 100644
--- a/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/calendar-fields-iterable.js b/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/calendar-fields-iterable.js
index c5010034a8b..a4216496cf9 100644
--- a/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/ZonedDateTime/compare/calendar-fields-iterable.js b/test/built-ins/Temporal/ZonedDateTime/compare/calendar-fields-iterable.js
index f900f9d1770..08940a85bd4 100644
--- a/test/built-ins/Temporal/ZonedDateTime/compare/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/ZonedDateTime/compare/calendar-fields-iterable.js
@@ -18,14 +18,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/ZonedDateTime/from/calendar-fields-iterable.js b/test/built-ins/Temporal/ZonedDateTime/from/calendar-fields-iterable.js
index 8285f4d67ed..befdc925abb 100644
--- a/test/built-ins/Temporal/ZonedDateTime/from/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/ZonedDateTime/from/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/ZonedDateTime/from/observable-get-overflow-argument-primitive.js b/test/built-ins/Temporal/ZonedDateTime/from/observable-get-overflow-argument-primitive.js
new file mode 100644
index 00000000000..6d3724cfabb
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/from/observable-get-overflow-argument-primitive.js
@@ -0,0 +1,49 @@
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.from
+description: options properties are extracted with string argument.
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.disambiguation",
+  "get options.disambiguation",
+  "getOwnPropertyDescriptor options.offset",
+  "get options.offset",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "get options.disambiguation.toString",
+  "call options.disambiguation.toString",
+  "get options.offset.toString",
+  "call options.offset.toString",
+  "get options.overflow.toString",
+  "call options.overflow.toString",
+];
+
+let actual = [];
+const options = TemporalHelpers.propertyBagObserver(actual, {
+  disambiguation: "compatible",
+  offset: "ignore",
+  overflow: "reject",
+}, "options");
+
+const result = Temporal.ZonedDateTime.from("2001-09-09T01:46:40+00:00[UTC]", options);
+assert.compareArray(actual, expected, "Successful call");
+assert.sameValue(result.epochNanoseconds, 1_000_000_000_000_000_000n);
+
+actual.splice(0);  // empty it for the next check
+const failureExpected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.disambiguation",
+  "get options.disambiguation",
+  "getOwnPropertyDescriptor options.offset",
+  "get options.offset",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+];
+assert.throws(TypeError, () => Temporal.ZonedDateTime.from(7, options));
+assert.compareArray(actual, failureExpected, "Failing call");
diff --git a/test/built-ins/Temporal/ZonedDateTime/from/observable-get-overflow-argument-string-invalid.js b/test/built-ins/Temporal/ZonedDateTime/from/observable-get-overflow-argument-string-invalid.js
new file mode 100644
index 00000000000..c7ab1200a3d
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/from/observable-get-overflow-argument-string-invalid.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.from
+description: options properties are extracted with ISO-invalid string argument.
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.disambiguation",
+  "get options.disambiguation",
+  "getOwnPropertyDescriptor options.offset",
+  "get options.offset",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+];
+
+let actual = [];
+const options = TemporalHelpers.propertyBagObserver(actual, {
+  disambiguation: "compatible",
+  offset: "ignore",
+  overflow: "reject",
+}, "options");
+
+assert.throws(RangeError, () => Temporal.ZonedDateTime.from("2020-13-34T25:60:60+99:99[UTC]", options));
+assert.compareArray(actual, expected);
diff --git a/test/built-ins/Temporal/ZonedDateTime/from/order-of-operations.js b/test/built-ins/Temporal/ZonedDateTime/from/order-of-operations.js
index 3e9a74abab6..8ec1a747715 100644
--- a/test/built-ins/Temporal/ZonedDateTime/from/order-of-operations.js
+++ b/test/built-ins/Temporal/ZonedDateTime/from/order-of-operations.js
@@ -9,6 +9,17 @@ features: [Temporal]
 ---*/
 
 const expected = [
+  // CopyDataProperties
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "getOwnPropertyDescriptor options.disambiguation",
+  "get options.disambiguation",
+  "getOwnPropertyDescriptor options.offset",
+  "get options.offset",
+  "getOwnPropertyDescriptor options.extra",
+  "get options.extra",
+  // ToTemporalCalendar
   "get item.calendar",
   "has item.calendar.dateAdd",
   "has item.calendar.dateFromFields",
@@ -72,21 +83,14 @@ const expected = [
   "has item.timeZone.getPossibleInstantsFor",
   "has item.timeZone.id",
   // InterpretTemporalDateTimeFields
-  "get options.disambiguation",
   "get options.disambiguation.toString",
   "call options.disambiguation.toString",
-  "get options.offset",
   "get options.offset.toString",
   "call options.offset.toString",
-  "get options.overflow",
   "get options.overflow.toString",
   "call options.overflow.toString",
   "get item.calendar.dateFromFields",
   "call item.calendar.dateFromFields",
-  // inside calendar.dateFromFields
-  "get options.overflow",
-  "get options.overflow.toString",
-  "call options.overflow.toString",
   // InterpretISODateTimeOffset
   "get item.timeZone.getPossibleInstantsFor",
   "call item.timeZone.getPossibleInstantsFor",
@@ -116,6 +120,7 @@ function createOptionsObserver({ overflow = "constrain", disambiguation = "compa
     overflow,
     disambiguation,
     offset,
+    extra: "property",
   }, "options");
 }
 
diff --git a/test/built-ins/Temporal/ZonedDateTime/from/overflow-wrong-type.js b/test/built-ins/Temporal/ZonedDateTime/from/overflow-wrong-type.js
index aa3f4899570..27086cd0ca6 100644
--- a/test/built-ins/Temporal/ZonedDateTime/from/overflow-wrong-type.js
+++ b/test/built-ins/Temporal/ZonedDateTime/from/overflow-wrong-type.js
@@ -49,14 +49,12 @@ assert.throws(RangeError, () => Temporal.ZonedDateTime.from(propertyBag, { overf
 assert.throws(RangeError, () => Temporal.ZonedDateTime.from(propertyBag, { overflow: 2 }), "number");
 assert.throws(RangeError, () => Temporal.ZonedDateTime.from(propertyBag, { overflow: {} }), "plain object");
 
-// toString property is read once by Calendar.dateFromFields() in the builtin
-// calendars, to get the option value for the date part, and then once again
-// internally to get the option value for the time part.
+// toString property should only be read and converted to a string once, because
+// a copied object with the resulting string on it is passed to
+// Calendar.dateFromFields().
 const expected = [
   "get overflow.toString",
   "call overflow.toString",
-  "get overflow.toString",
-  "call overflow.toString",
 ];
 const actual = [];
 const observer = TemporalHelpers.toPrimitiveObserver(actual, "constrain", "overflow");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/equals/calendar-fields-iterable.js b/test/built-ins/Temporal/ZonedDateTime/prototype/equals/calendar-fields-iterable.js
index 9efae1eece1..732f3fd1ebf 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/equals/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/equals/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/getISOFields/order-of-operations.js b/test/built-ins/Temporal/ZonedDateTime/prototype/getISOFields/order-of-operations.js
index 23c57b5bf50..155ccd19bac 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/getISOFields/order-of-operations.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/getISOFields/order-of-operations.js
@@ -13,8 +13,6 @@ features: [Temporal]
 const expected = [
   "get this.timeZone.getOffsetNanosecondsFor",
   "call this.timeZone.getOffsetNanosecondsFor",
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
 ];
 const actual = [];
 
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/round/order-of-operations.js b/test/built-ins/Temporal/ZonedDateTime/prototype/round/order-of-operations.js
index 36198bd2018..c14cf4bb419 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/round/order-of-operations.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/round/order-of-operations.js
@@ -31,9 +31,6 @@ const expected = [
   "call this.calendar.dateAdd",
   "get this.timeZone.getPossibleInstantsFor",
   "call this.timeZone.getPossibleInstantsFor",
-  // GetOffsetNanosecondsFor
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
   // InterpretISODateTimeOffset
   "get this.timeZone.getPossibleInstantsFor",
   "call this.timeZone.getPossibleInstantsFor",
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/since/calendar-fields-iterable.js b/test/built-ins/Temporal/ZonedDateTime/prototype/since/calendar-fields-iterable.js
index 1f8eb2aca6c..66267a5cca2 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/since/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/since/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toJSON/order-of-operations.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toJSON/order-of-operations.js
new file mode 100644
index 00000000000..91c3008fc52
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toJSON/order-of-operations.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.tojson
+description: Properties on objects passed to toJSON() are accessed in the correct order
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "get this.timeZone.getOffsetNanosecondsFor",
+  "call this.timeZone.getOffsetNanosecondsFor",
+  "get this.timeZone.id",
+  "get this.calendar.id",
+];
+const actual = [];
+
+const timeZone = TemporalHelpers.timeZoneObserver(actual, "this.timeZone");
+const calendar = TemporalHelpers.calendarObserver(actual, "this.calendar");
+const instance = new Temporal.ZonedDateTime(0n, timeZone, calendar);
+// clear observable operations that occurred during the constructor call
+actual.splice(0);
+
+instance.toJSON();
+assert.compareArray(actual, expected, "order of operations");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toString/order-of-operations.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toString/order-of-operations.js
index 59e4dc1c066..48c4fa95a85 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/toString/order-of-operations.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toString/order-of-operations.js
@@ -29,8 +29,6 @@ const expected = [
   "call options.timeZoneName.toString",
   "get this.timeZone.getOffsetNanosecondsFor",
   "call this.timeZone.getOffsetNanosecondsFor",
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
   "get this.timeZone.id",
   "get this.calendar.id",
 ];
@@ -75,8 +73,6 @@ const expectedForFractionalSecondDigits = [
   "call options.timeZoneName.toString",
   "get this.timeZone.getOffsetNanosecondsFor",
   "call this.timeZone.getOffsetNanosecondsFor",
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
   "get this.timeZone.id",
   "get this.calendar.id",
 ];
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/until/calendar-fields-iterable.js b/test/built-ins/Temporal/ZonedDateTime/prototype/until/calendar-fields-iterable.js
index f9ca14e1931..befb9f19624 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/until/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/until/calendar-fields-iterable.js
@@ -17,14 +17,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/with/calendar-fields-iterable.js b/test/built-ins/Temporal/ZonedDateTime/prototype/with/calendar-fields-iterable.js
index 326a7b8d016..84d15850cf8 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/with/calendar-fields-iterable.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/with/calendar-fields-iterable.js
@@ -6,7 +6,7 @@ esid: sec-temporal.zoneddatetime.prototype.with
 description: Verify the result of calendar.fields() is treated correctly.
 info: |
     sec-temporal.zoneddatetime.prototype.with step 9:
-      9. Let _fieldNames_ be ? CalendarFields(_calendar_, « *"day"*, *"hour"*, *"microsecond"*, *"millisecond"*, *"minute"*, *"month"*, *"monthCode"*, *"nanosecond"*, *"second"*, *"year"* »).
+      9. Let _fieldNames_ be ? CalendarFields(_calendar_, « *"day"*, *"month"*, *"monthCode"*, *"year"* »).
     sec-temporal-calendarfields step 4:
       4. Let _result_ be ? IterableToList(_fieldsArray_).
 includes: [compareArray.js, temporalHelpers.js]
@@ -15,14 +15,8 @@ features: [Temporal]
 
 const expected = [
   "day",
-  "hour",
-  "microsecond",
-  "millisecond",
-  "minute",
   "month",
   "monthCode",
-  "nanosecond",
-  "second",
   "year",
 ];
 
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/with/calendar-options.js b/test/built-ins/Temporal/ZonedDateTime/prototype/with/calendar-options.js
new file mode 100644
index 00000000000..fba8b67aa32
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/with/calendar-options.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.with
+description: >
+  The options argument is copied and the copy is passed to
+  Calendar#dateFromFields.
+features: [Temporal]
+---*/
+
+const options = {
+  extra: "property",
+};
+let calledDateFromFields = 0;
+class Calendar extends Temporal.Calendar {
+  constructor() {
+    super("iso8601");
+  }
+  dateFromFields(fields, optionsArg) {
+    ++calledDateFromFields;
+    assert.notSameValue(optionsArg, options, "should pass copied options object");
+    assert.sameValue(optionsArg.extra, "property", "should copy all properties from options object");
+    assert.sameValue(Object.getPrototypeOf(optionsArg), null, "Copy has null prototype");
+    return super.dateFromFields(fields, optionsArg);
+  }
+};
+const calendar = new Calendar();
+const datetime = new Temporal.ZonedDateTime(0n, "UTC", calendar);
+const result = datetime.with({ year: 1971 }, options);
+assert.sameValue(result.epochNanoseconds, 365n * 86400_000_000_000n, "year changed from 1970 to 1971")
+assert.sameValue(calledDateFromFields, 1, "should have called overridden dateFromFields once");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/with/order-of-operations.js b/test/built-ins/Temporal/ZonedDateTime/prototype/with/order-of-operations.js
index eb8c787e979..0374bdcb1da 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/with/order-of-operations.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/with/order-of-operations.js
@@ -12,38 +12,29 @@ const expected = [
   // RejectObjectWithCalendarOrTimeZone
   "get fields.calendar",
   "get fields.timeZone",
+  // CopyDataProperties
+  "ownKeys options",
+  "getOwnPropertyDescriptor options.overflow",
+  "get options.overflow",
+  "getOwnPropertyDescriptor options.disambiguation",
+  "get options.disambiguation",
+  "getOwnPropertyDescriptor options.offset",
+  "get options.offset",
+  "getOwnPropertyDescriptor options.extra",
+  "get options.extra",
+  // GetOffsetNanosecondsFor on receiver
+  "get this.timeZone.getOffsetNanosecondsFor",
+  "call this.timeZone.getOffsetNanosecondsFor",
   // CalendarFields
   "get this.calendar.fields",
   "call this.calendar.fields",
   // PrepareTemporalFields on receiver
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
   "get this.calendar.day",
   "call this.calendar.day",
-  "get this.timeZone.getOffsetNanosecondsFor",  // ZonedDateTime.p.hour
-  "call this.timeZone.getOffsetNanosecondsFor",
-  "get this.timeZone.getOffsetNanosecondsFor",  // ZonedDateTime.p.microsecond
-  "call this.timeZone.getOffsetNanosecondsFor",
-  "get this.timeZone.getOffsetNanosecondsFor",  // ZonedDateTime.p.millisecond
-  "call this.timeZone.getOffsetNanosecondsFor",
-  "get this.timeZone.getOffsetNanosecondsFor",  // ZonedDateTime.p.minute
-  "call this.timeZone.getOffsetNanosecondsFor",
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
   "get this.calendar.month",
   "call this.calendar.month",
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
   "get this.calendar.monthCode",
   "call this.calendar.monthCode",
-  "get this.timeZone.getOffsetNanosecondsFor",  // ZonedDateTime.p.nanosecond
-  "call this.timeZone.getOffsetNanosecondsFor",
-  "get this.timeZone.getOffsetNanosecondsFor",  // ZonedDateTime.p.offset
-  "call this.timeZone.getOffsetNanosecondsFor",
-  "get this.timeZone.getOffsetNanosecondsFor",  // ZonedDateTime.p.second
-  "call this.timeZone.getOffsetNanosecondsFor",
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
   "get this.calendar.year",
   "call this.calendar.year",
   // PrepareTemporalFields on argument
@@ -84,21 +75,14 @@ const expected = [
   "get this.calendar.mergeFields",
   "call this.calendar.mergeFields",
   // InterpretTemporalDateTimeFields
-  "get options.disambiguation",
   "get options.disambiguation.toString",
   "call options.disambiguation.toString",
-  "get options.offset",
   "get options.offset.toString",
   "call options.offset.toString",
-  "get options.overflow",
   "get options.overflow.toString",
   "call options.overflow.toString",
   "get this.calendar.dateFromFields",
   "call this.calendar.dateFromFields",
-  // Calendar.p.dateFromFields
-  "get options.overflow",
-  "get options.overflow.toString",
-  "call options.overflow.toString",
   // InterpretISODateTimeOffset
   "get this.timeZone.getPossibleInstantsFor",
   "call this.timeZone.getPossibleInstantsFor",
@@ -131,6 +115,7 @@ const options = TemporalHelpers.propertyBagObserver(actual, {
   overflow: "constrain",
   disambiguation: "compatible",
   offset: "prefer",
+  extra: "property",
 }, "options");
 
 instance.with(fields, options);
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/with/overflow-wrong-type.js b/test/built-ins/Temporal/ZonedDateTime/prototype/with/overflow-wrong-type.js
index 43bcec49c64..309f87d19c1 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/with/overflow-wrong-type.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/with/overflow-wrong-type.js
@@ -31,14 +31,12 @@ assert.throws(RangeError, () => datetime.with({ second: 41 }, { overflow: 2 }),
 assert.throws(RangeError, () => datetime.with({ second: 41 }, { overflow: 2n }), "bigint");
 assert.throws(RangeError, () => datetime.with({ second: 41 }, { overflow: {} }), "plain object");
 
-// toString property is read once by Calendar.dateFromFields() in the builtin
-// calendars, to get the option value for the date part, and then once again
-// internally to get the option value for the time part.
+// toString property should only be read and converted to a string once, because
+// a copied object with the resulting string on it is passed to
+// Calendar.dateFromFields().
 const expected = [
   "get overflow.toString",
   "call overflow.toString",
-  "get overflow.toString",
-  "call overflow.toString",
 ];
 const actual = [];
 const observer = TemporalHelpers.toPrimitiveObserver(actual, "constrain", "overflow");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/with/receiver-offset-broken.js b/test/built-ins/Temporal/ZonedDateTime/prototype/with/receiver-offset-broken.js
index 5595ce15993..bddf9340edf 100644
--- a/test/built-ins/Temporal/ZonedDateTime/prototype/with/receiver-offset-broken.js
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/with/receiver-offset-broken.js
@@ -3,18 +3,16 @@
 
 /*---
 esid: sec-temporal.zoneddatetime.protoype.with
-description: TypeError thrown when the offset field of the receiver is broken
+description: >
+  TypeError thrown when the offset field of the argument or the object returned
+  from mergeFields is broken
 info: |
-    10. Let _fieldNames_ be ? CalendarFields(_calendar_, « *"day"*, *"hour"*, *"microsecond"*, *"millisecond"*, *"minute"*, *"month"*, *"monthCode"*, *"nanosecond"*, *"second"*, *"year"* »).
-    11. Append *"offset"* to _fieldNames_.
-    12. Let _partialZonedDateTime_ be ? PreparePartialTemporalFields(_temporalZonedDateTimeLike_, _fieldNames_).
-    ...
-    17. Append *"timeZone"* to _fieldNames_.
-    18. Let _fields_ be ? PrepareTemporalFields(_zonedDateTime_, _fieldNames_, « *"timeZone"*, *"offset"* »).
-    19. Set _fields_ to ? CalendarMergeFields(_calendar_, _fields_, _partialZonedDateTime_).
-    20. Set _fields_ to ? PrepareTemporalFields(_fields_, _fieldNames_, « *"timeZone"*, *"offset"* »).
-    21. Let _offsetString_ be ! Get(_fields_, *"offset"*).
-    22. Assert: Type(_offsetString_) is String.
+    7. Let _fieldNames_ be ? CalendarFields(_calendar_, « *"day"*, *"month"*, *"monthCode"*, *"year"* »).
+    8. Append *"hour"*, *"microsecond"*, *"millisecond"*, *"minute"*, *"nanosecond"*, *"offset"*, and *"second"* to _fieldNames_.
+    9. Let _fields_ be ? PrepareTemporalFields(_zonedDateTime_, _fieldNames_, « *"offset"* »).
+    10. Let _partialZonedDateTime_ be ? PrepareTemporalFields(_temporalZonedDateTimeLike_, _fieldNames_, ~partial~).
+    11. Set _fields_ to ? CalendarMergeFields(_calendar_, _fields_, _partialZonedDateTime_).
+    12. Set _fields_ to ? PrepareTemporalFields(_fields_, _fieldNames_, « *"offset"* »).
 features: [Temporal]
 ---*/
 
@@ -43,34 +41,16 @@ class ObservedCalendar extends Temporal.Calendar {
 const calendar = new ObservedCalendar();
 const dateTime = new Temporal.ZonedDateTime(1_000_000_000_000_000_000n, "UTC", calendar);
 
-// Test throw in step 12
+// Test throw in step 10
 
 assert.throws(TypeError, () => dateTime.with({ offset: Symbol("can't convert to string") }), "conversion failure on ZonedDateTime-like");
 assert.sameValue(calendar.mergeFieldsCalled, 0, "calendar.mergeFields should not be called");
 
 calendar.resetCalls();
 
-// Test throw in step 20 (before sabotaging the ZonedDateTime instance)
+// Test throw in step 12 (before sabotaging the ZonedDateTime instance)
 
 assert.throws(TypeError, () => dateTime.with({ year: 2002 }), "conversion failure on sabotaged return value from mergeFields");
 assert.sameValue(calendar.mergeFieldsCalled, 1, "calendar.mergeFields was called once");
 
 calendar.resetCalls();
-
-// Test throw in step 18
-
-Object.defineProperty(dateTime, "offset", { value: Symbol("can't convert to string"), configurable: true });
-
-assert.throws(TypeError, () => dateTime.with({ year: 2002 }), "conversion failure on sabotaged offset field of receiver");
-assert.sameValue(calendar.mergeFieldsCalled, 0, "calendar.mergeFields should not be called");
-
-calendar.resetCalls();
-
-// Test offset being required in step 18
-
-Object.defineProperty(dateTime, "offset", { value: undefined });
-
-assert.throws(TypeError, () => dateTime.with({ year: 2002 }), "offset property is required on receiver");
-assert.sameValue(calendar.mergeFieldsCalled, 0, "calendar.mergeFields should not be called");
-
-calendar.resetCalls();