diff --git a/serialize-core/src/commonTest/kotlin/it/unibo/tuprolog/serialize/TestTermDeserializer.kt b/serialize-core/src/commonTest/kotlin/it/unibo/tuprolog/serialize/TestTermDeserializer.kt
index b1dc5eac5..b2d83ce91 100644
--- a/serialize-core/src/commonTest/kotlin/it/unibo/tuprolog/serialize/TestTermDeserializer.kt
+++ b/serialize-core/src/commonTest/kotlin/it/unibo/tuprolog/serialize/TestTermDeserializer.kt
@@ -14,17 +14,16 @@ class TestTermDeserializer {
         deserializer.assertTermDeserializationWorks("\"other atom\"") {
             atomOf("other atom")
         }
-
     }
 
     @Test
     fun testAtomDeserializationInYaml() {
         val deserializer: TermDeserializer = TermDeserializer.of(MimeType.Yaml)
         assertEquals(MimeType.Yaml, deserializer.mimeType)
-        deserializer.assertTermDeserializationWorks("--- \"hello\"") {
+        deserializer.assertTermDeserializationWorks("\"hello\"") {
             atomOf("hello")
         }
-        deserializer.assertTermDeserializationWorks("--- \"other atom\"") {
+        deserializer.assertTermDeserializationWorks("\"other atom\"") {
             atomOf("other atom")
         }
 
@@ -46,10 +45,10 @@ class TestTermDeserializer {
     fun testNumericDeserializationInYAML() {
         val deserializer: TermDeserializer = TermDeserializer.of(MimeType.Yaml)
         assertEquals(MimeType.Yaml, deserializer.mimeType)
-        deserializer.assertTermDeserializationWorks("--- 2") {
+        deserializer.assertTermDeserializationWorks("2") {
             numOf(2)
         }
-        deserializer.assertTermDeserializationWorks("--- 3.1") {
+        deserializer.assertTermDeserializationWorks("3.1") {
             numOf(3.1)
         }
     }
@@ -67,12 +66,11 @@ class TestTermDeserializer {
     fun testListDeserializationInYAML() {
         val deserializer: TermDeserializer = TermDeserializer.of(MimeType.Yaml)
         assertEquals(MimeType.Yaml, deserializer.mimeType)
-        var actual = """---
+        val actual = """
                 |list:
-                |- "hello"
+                |- hello
                 |- 1
                 |- true
-                |
                 """.trimMargin()
         deserializer.assertTermDeserializationWorks(actual) {
             listOf(atomOf("hello"), numOf(1), truthOf(true))
@@ -92,7 +90,7 @@ class TestTermDeserializer {
     fun testSetDeserializationInYAML() {
         val deserializer: TermDeserializer = TermDeserializer.of(MimeType.Yaml)
         assertEquals(MimeType.Yaml, deserializer.mimeType)
-        var actual = """---
+        val actual = """
                 |set:
                 |- "hello"
                 |- 1
@@ -112,9 +110,9 @@ class TestTermDeserializer {
             structOf("f", atomOf("hello"), numOf(2))
         }
 
-        deserializer.assertTermDeserializationWorks("{\"fun\":\"f\",\"args\":[\"prova 2\",3.0,{\"list\":[\"qua ci va una lista\",true]}]}") {
+        deserializer.assertTermDeserializationWorks("{\"fun\":\"f\",\"args\":[\"prova 2\",{\"real\":3.0},{\"list\":[\"qua ci va una lista\",true]}]}") {
             structOf(
-                "f", atomOf("prova 2"), numOf(3.0),
+                "f", atomOf("prova 2"), realOf(3.0),
                 listOf(atomOf("qua ci va una lista"), truthOf(true))
             )
         }
@@ -124,30 +122,28 @@ class TestTermDeserializer {
     fun testStructDeserializationInYAML() {
         val deserializer: TermDeserializer = TermDeserializer.of(MimeType.Yaml)
         assertEquals(MimeType.Yaml, deserializer.mimeType)
-        var actual = """---
-                |fun: "f"
+        var actual = """
+                |fun: f
                 |args:
-                |- "hello"
+                |- hello
                 |- 2
-                |
                 """.trimMargin()
         deserializer.assertTermDeserializationWorks(actual) {
             structOf("f", atomOf("hello"), numOf(2))
         }
 
-        actual = """---
+        actual = """
                 |fun: "f"
                 |args:
                 |- "prova 2"
-                |- 3.0
+                |- real: 3.0
                 |- list:
                 |  - "qua ci va una lista"
                 |  - true
-                |
                 """.trimMargin()
         deserializer.assertTermDeserializationWorks(actual) {
             structOf(
-                "f", atomOf("prova 2"), numOf(3.0),
+                "f", atomOf("prova 2"), realOf(3.0),
                 listOf(atomOf("qua ci va una lista"), truthOf(true))
             )
         }
@@ -170,9 +166,8 @@ class TestTermDeserializer {
 
         assertEquals(MimeType.Yaml, deserializer.mimeType)
 
-        val actual = """---
+        val actual = """
                 |var: "X"
-                |
                 """.trimMargin()
         deserializer.assertTermDeserializationWorks(actual) {
             varOf("X")
@@ -195,10 +190,10 @@ class TestTermDeserializer {
     fun testConstantDeserializationInYAML() {
         val deserializer: TermDeserializer = TermDeserializer.of(MimeType.Yaml)
         assertEquals(MimeType.Yaml, deserializer.mimeType)
-        deserializer.assertTermDeserializationWorks("--- true\n") {
+        deserializer.assertTermDeserializationWorks("true") {
             truthOf(true)
         }
-        deserializer.assertTermDeserializationWorks("--- false\n") {
+        deserializer.assertTermDeserializationWorks("false") {
             truthOf(false)
         }
     }
diff --git a/serialize-core/src/commonTest/kotlin/it/unibo/tuprolog/serialize/TestUtils.kt b/serialize-core/src/commonTest/kotlin/it/unibo/tuprolog/serialize/TestUtils.kt
index fa2703b11..ca7aee4be 100644
--- a/serialize-core/src/commonTest/kotlin/it/unibo/tuprolog/serialize/TestUtils.kt
+++ b/serialize-core/src/commonTest/kotlin/it/unibo/tuprolog/serialize/TestUtils.kt
@@ -39,7 +39,14 @@ fun Serializer<Term>.assertTermSerializationWorks(expected: String, actualGenera
  * Utility assertion method aimed at checking if a deserializer correctly works
  */
 fun <T : Term> Deserializer<T>.assertDeserializationWorks(expected: T, actual: String) {
-    kotlin.test.assertTrue { termsRepresentationsAreEqual(expected, deserialize(actual)) }
+    val deserialized = deserialize(actual)
+    kotlin.test.assertTrue("""
+        |Expected:
+        |   $expected
+        |got:
+        |   $deserialized
+        |
+    """.trimMargin()) { termsRepresentationsAreEqual(expected, deserialized) }
 }
 
 /**
diff --git a/serialize-core/src/jsMain/kotlin/it/unibo/tuprolog/serialize/JsTermDeobjectifier.kt b/serialize-core/src/jsMain/kotlin/it/unibo/tuprolog/serialize/JsTermDeobjectifier.kt
index 59b48587d..3c1ffde7b 100644
--- a/serialize-core/src/jsMain/kotlin/it/unibo/tuprolog/serialize/JsTermDeobjectifier.kt
+++ b/serialize-core/src/jsMain/kotlin/it/unibo/tuprolog/serialize/JsTermDeobjectifier.kt
@@ -36,14 +36,16 @@ class JsTermDeobjectifier : TermDeobjectifier<dynamic> {
     private fun deobjectifyReal(value: dynamic): Term {
         return when (val actualValue = value["real"]) {
             is String -> scope.realOf(actualValue as String)
-            else -> deobjectifyNumber(actualValue)
+            is Double -> scope.realOf(actualValue as Double)
+            else -> throw DeobjectificationException(value)
         }
     }
 
     private fun deobjectifyInteger(value: dynamic): Term {
         return when (val actualValue = value["integer"]) {
             is String -> scope.intOf(actualValue as String)
-            else -> deobjectifyNumber(actualValue)
+            is Int -> scope.intOf(actualValue as Int)
+            else -> throw DeobjectificationException(value)
         }
     }
 
@@ -114,15 +116,7 @@ class JsTermDeobjectifier : TermDeobjectifier<dynamic> {
     }
 
     private fun deobjectifyNumber(value: dynamic): Term {
-        return when (value) {
-            is Int -> scope.numOf(value as Int)
-            is Long -> scope.numOf(value as Long)
-            is Double -> scope.numOf(value as Double)
-            is Byte -> scope.numOf(value as Byte)
-            is Short -> scope.numOf(value as Short)
-            is Float -> scope.numOf(value as Float)
-            else -> throw DeobjectificationException(value)
-        }
+        return scope.numOf(value.toString())
     }
 
 }
\ No newline at end of file