From 80b38e07a8216ab3480dffaffc20832cf06f79d8 Mon Sep 17 00:00:00 2001
From: Brad Dunbar <dunbarb2@gmail.com>
Date: Sun, 14 Apr 2024 10:35:31 -0400
Subject: [PATCH 1/2] `truncate` has no effect when `len == self.len()`

---
 src/bytes_mut.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/bytes_mut.rs b/src/bytes_mut.rs
index c9f563430..e130709df 100644
--- a/src/bytes_mut.rs
+++ b/src/bytes_mut.rs
@@ -422,7 +422,7 @@ impl BytesMut {
     /// assert_eq!(buf, b"hello"[..]);
     /// ```
     pub fn truncate(&mut self, len: usize) {
-        if len <= self.len() {
+        if len < self.len() {
             unsafe {
                 self.set_len(len);
             }

From 9e7d8effada42a68f5a8a8a3e13eb090fdc59491 Mon Sep 17 00:00:00 2001
From: Brad Dunbar <dunbarb2@gmail.com>
Date: Sun, 14 Apr 2024 10:42:26 -0400
Subject: [PATCH 2/2] Add a SAFETY comment.

---
 src/bytes_mut.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/bytes_mut.rs b/src/bytes_mut.rs
index e130709df..0248df856 100644
--- a/src/bytes_mut.rs
+++ b/src/bytes_mut.rs
@@ -424,6 +424,7 @@ impl BytesMut {
     pub fn truncate(&mut self, len: usize) {
         if len < self.len() {
             unsafe {
+                // SAFETY: Shrinking the buffer cannot expose uninitialized bytes.
                 self.set_len(len);
             }
         }