From bc4f1b8f8e36bb9cd2b70714f6c53b8f5b59dce7 Mon Sep 17 00:00:00 2001
From: Patrick Chin <patrickcjh@gmail.com>
Date: Thu, 16 Oct 2025 02:26:57 +0800
Subject: [PATCH 1/2] Fix missing escape character lookup for forward slash
 (solidus).

---
 src/ser.rs    | 4 +++-
 tests/test.rs | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/ser.rs b/src/ser.rs
index 50c06f938..2eeff0911 100644
--- a/src/ser.rs
+++ b/src/ser.rs
@@ -2115,6 +2115,7 @@ where
             self::FF => CharEscape::FormFeed,
             self::RR => CharEscape::CarriageReturn,
             self::QU => CharEscape::Quote,
+            self::FS => CharEscape::Solidus,
             self::BS => CharEscape::ReverseSolidus,
             self::UU => CharEscape::AsciiControl(byte),
             // Safety: the escape table does not contain any other type of character.
@@ -2138,6 +2139,7 @@ const NN: u8 = b'n'; // \x0A
 const FF: u8 = b'f'; // \x0C
 const RR: u8 = b'r'; // \x0D
 const QU: u8 = b'"'; // \x22
+const FS: u8 = b'/'; // \x2F
 const BS: u8 = b'\\'; // \x5C
 const UU: u8 = b'u'; // \x00...\x1F except the ones above
 const __: u8 = 0;
@@ -2148,7 +2150,7 @@ static ESCAPE: [u8; 256] = [
     //   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
     UU, UU, UU, UU, UU, UU, UU, UU, BB, TT, NN, UU, FF, RR, UU, UU, // 0
     UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, // 1
-    __, __, QU, __, __, __, __, __, __, __, __, __, __, __, __, __, // 2
+    __, __, QU, __, __, __, __, __, __, __, __, __, __, __, __, FS, // 2
     __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 3
     __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 4
     __, __, __, __, __, __, __, __, __, __, __, __, BS, __, __, __, // 5
diff --git a/tests/test.rs b/tests/test.rs
index f608679e6..fa64e3c0b 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -203,7 +203,7 @@ fn test_write_char() {
         ('n', "\"n\""),
         ('"', "\"\\\"\""),
         ('\\', "\"\\\\\""),
-        ('/', "\"/\""),
+        ('/', "\"\\/\""),
         ('\x08', "\"\\b\""),
         ('\x0C', "\"\\f\""),
         ('\n', "\"\\n\""),

From c4e2b4ede7deba23e3bd01172942ba2b9b1c0c4f Mon Sep 17 00:00:00 2001
From: Patrick Chin <patrickcjh@gmail.com>
Date: Thu, 16 Oct 2025 18:49:46 +0800
Subject: [PATCH 2/2] Preserve the default behavior of not escaping solidus.

---
 src/ser.rs    | 1 +
 tests/test.rs | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/ser.rs b/src/ser.rs
index 2eeff0911..10b479447 100644
--- a/src/ser.rs
+++ b/src/ser.rs
@@ -1794,6 +1794,7 @@ pub trait Formatter {
                 ];
                 writer.write_all(bytes)
             }
+            Solidus => writer.write_all(&[escape_char]),
             _ => writer.write_all(&[b'\\', escape_char]),
         }
     }
diff --git a/tests/test.rs b/tests/test.rs
index fa64e3c0b..f608679e6 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -203,7 +203,7 @@ fn test_write_char() {
         ('n', "\"n\""),
         ('"', "\"\\\"\""),
         ('\\', "\"\\\\\""),
-        ('/', "\"\\/\""),
+        ('/', "\"/\""),
         ('\x08', "\"\\b\""),
         ('\x0C', "\"\\f\""),
         ('\n', "\"\\n\""),