From 94269022a0837a1fde093f59263086f5066c36f4 Mon Sep 17 00:00:00 2001
From: Yuki Okushi <huyuumi.dev@gmail.com>
Date: Sat, 11 Apr 2026 17:53:45 +0900
Subject: [PATCH] perf(bytestring): improve `From<ByteString> for String`
 performance

---
 bytestring/CHANGES.md | 1 +
 bytestring/src/lib.rs | 8 ++------
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/bytestring/CHANGES.md b/bytestring/CHANGES.md
index b29e3e72..a06640be 100644
--- a/bytestring/CHANGES.md
+++ b/bytestring/CHANGES.md
@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Minimum supported Rust version (MSRV) is now 1.88.
+- Improve `From<ByteString> for String` performance.
 
 ## 1.5.0
 
diff --git a/bytestring/src/lib.rs b/bytestring/src/lib.rs
index 10f5cc4b..16e26cf9 100644
--- a/bytestring/src/lib.rs
+++ b/bytestring/src/lib.rs
@@ -6,11 +6,7 @@
 
 extern crate alloc;
 
-use alloc::{
-    boxed::Box,
-    string::{String, ToString},
-    vec::Vec,
-};
+use alloc::{boxed::Box, string::String, vec::Vec};
 use core::{borrow::Borrow, fmt, hash, ops, str};
 
 use bytes::Bytes;
@@ -189,7 +185,7 @@ impl From<Box<str>> for ByteString {
 impl From<ByteString> for String {
     #[inline]
     fn from(value: ByteString) -> Self {
-        value.to_string()
+        String::from_utf8(value.0.into()).expect("ByteString invariant violated")
     }
 }