https://git.ruby-lang.org/ruby.git/commit/?id=499660b04f

From 499660b04f22c0b7203dbd1de31a85443d4290b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Thu, 30 Sep 2021 15:32:34 +0900
Subject: downcase_single/upcase_single: assume ASCII

These functions assume ASCII compatibility.  That has to be ensured in
their caller.
---
 string.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/string.c b/string.c
index 80f3358c2c..3717493fa1 100644
--- a/string.c
+++ b/string.c
@@ -6897,9 +6897,8 @@ upcase_single(VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L6897
 
     while (s < send) {
         unsigned int c = *(unsigned char*)s;
-        const rb_encoding *const enc = 0;
 
-        if (rb_enc_isascii(c, enc) && 'a' <= c && c <= 'z') {
+        if ('a' <= c && c <= 'z') {
             *s = 'A' + (c - 'a');
             modified = true;
         }
@@ -6988,9 +6987,8 @@ downcase_single(VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L6987
 
     while (s < send) {
         unsigned int c = *(unsigned char*)s;
-        const rb_encoding *const enc = 0;
 
-        if (rb_enc_isascii(c, enc) && 'A' <= c && c <= 'Z') {
+        if ('A' <= c && c <= 'Z') {
             *s = 'a' + (c - 'A');
             modified = true;
         }
-- 
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