From f424a15c74794c0c9f5834d976db81a45e00d300 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sun, 12 Dec 2021 20:08:45 -0800
Subject: [PATCH 1/2] Add test of cases that are NOT supposed to be numbers

The latter two of these currently fail.

    thread 'test_numbers' panicked at 'expected string. input="+0127", result=Number(PosInt(127))', tests/test_de.rs:352:18

    thread 'test_numbers' panicked at 'expected string. input="-0127", result=Number(NegInt(-127))', tests/test_de.rs:352:18
---
 tests/test_de.rs | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tests/test_de.rs b/tests/test_de.rs
index 9d7b5bc6..67464b17 100644
--- a/tests/test_de.rs
+++ b/tests/test_de.rs
@@ -339,7 +339,17 @@ fn test_numbers() {
         let value = serde_yaml::from_str::<Value>(yaml).unwrap();
         match value {
             Value::Number(number) => assert_eq!(number.to_string(), expected),
-            _ => panic!("expected number"),
+            _ => panic!("expected number. input={:?}, result={:?}", yaml, value),
+        }
+    }
+
+    // NOT numbers.
+    let cases = ["0127", "+0127", "-0127"];
+    for yaml in &cases {
+        let value = serde_yaml::from_str::<Value>(yaml).unwrap();
+        match value {
+            Value::String(string) => assert_eq!(string, *yaml),
+            _ => panic!("expected string. input={:?}, result={:?}", yaml, value),
         }
     }
 }

From 57f2e661b8db22491b404f0e515c362bc6d8a235 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sun, 12 Dec 2021 20:16:53 -0800
Subject: [PATCH 2/2] Treat YAML 1.1 style octals with sign as string, not base
 10 number

---
 src/de.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/de.rs b/src/de.rs
index e5f21b06..bab38d13 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -987,7 +987,10 @@ where
             return visitor.visit_i64(n);
         }
     }
-    if v.len() > 1 && v.starts_with('0') && v.bytes().all(|b| b.is_ascii_digit()) {
+    if {
+        let v = v.trim_start_matches(&['-', '+'][..]);
+        v.len() > 1 && v.starts_with('0') && v[1..].bytes().all(|b| b.is_ascii_digit())
+    } {
         // After handling the different number encodings above if we are left
         // with leading zero(s) followed by numeric characters this is in fact a
         // string according to the YAML 1.2 spec.