From 64afa739f39ded93bfbbe3fb8e49720eb4c6d12d Mon Sep 17 00:00:00 2001
From: thedavidmeister <thedavidmeister@gmail.com>
Date: Sat, 30 Dec 2023 01:46:13 +0400
Subject: [PATCH] more test cases

---
 src/de.rs           |  1 +
 tests/test_serde.rs | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/src/de.rs b/src/de.rs
index 806950e2..640e8795 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -1105,6 +1105,7 @@ pub(crate) fn ambiguous_string(scalar: &str) -> bool {
     parse_bool(&lower_scalar).is_some()
         || parse_null(&lower_scalar.as_bytes()).is_some()
         || lower_scalar.len() == 0
+        // Can unwrap because we just checked the length.
         || lower_scalar.bytes().nth(0).unwrap().is_ascii_digit()
         || lower_scalar.starts_with('-')
         || lower_scalar.starts_with('.')
diff --git a/tests/test_serde.rs b/tests/test_serde.rs
index c440b698..bd1fd7fe 100644
--- a/tests/test_serde.rs
+++ b/tests/test_serde.rs
@@ -367,6 +367,18 @@ fn test_moar_strings_needing_quote() {
         "9.3",
         // https://github.com/dtolnay/serde-yaml/pull/398#discussion_r1432944356
         "2E234567",
+        // https://yaml.org/spec/1.2.2/#1022-tag-resolution
+        "0o7",
+        "0x3A",
+        "+12.3",
+        "0.",
+        "-0.0",
+        "12e3",
+        "-2E+05",
+        "0",
+        "-0",
+        "3",
+        "-19",
     ] {
         let thing = Struct {
             s: s.to_string(),