From 385e5dcc058dfd4bb29f95832be11ae8e28bd16c Mon Sep 17 00:00:00 2001
From: Yuki Okushi <huyuumi.dev@gmail.com>
Date: Tue, 21 Apr 2026 21:56:49 +0900
Subject: [PATCH] perf(bytestring): prefer `from_utf8_unchecked`

---
 bytestring/src/lib.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/bytestring/src/lib.rs b/bytestring/src/lib.rs
index 16e26cf9..e50a0477 100644
--- a/bytestring/src/lib.rs
+++ b/bytestring/src/lib.rs
@@ -185,7 +185,8 @@ impl From<Box<str>> for ByteString {
 impl From<ByteString> for String {
     #[inline]
     fn from(value: ByteString) -> Self {
-        String::from_utf8(value.0.into()).expect("ByteString invariant violated")
+        // SAFETY: UTF-8 validity is guaranteed during construction.
+        unsafe { String::from_utf8_unchecked(value.0.into()) }
     }
 }