https://git.ruby-lang.org/ruby.git/commit/?id=5776ae3475

From 5776ae347540ac19c40d146a3566a806cd176bf1 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 3 May 2019 15:33:59 +0900
Subject: UTF-8 is one of byte based encodings


diff --git a/string.c b/string.c
index b8ff2dd..2febe52 100644
--- a/string.c
+++ b/string.c
@@ -6600,7 +6600,7 @@ rb_str_upcase_bang(int argc, VALUE *argv, VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L6600
     str_modify_keep_cr(str);
     enc = STR_ENC_GET(str);
     rb_str_check_dummy_enc(enc);
-    if (((flags&ONIGENC_CASE_ASCII_ONLY) && (enc==rb_utf8_encoding() || rb_enc_mbmaxlen(enc)==1))
+    if (((flags&ONIGENC_CASE_ASCII_ONLY) && (rb_enc_mbmaxlen(enc)==1))
 	|| (!(flags&ONIGENC_CASE_FOLD_TURKISH_AZERI) && ENC_CODERANGE(str)==ENC_CODERANGE_7BIT)) {
         char *s = RSTRING_PTR(str), *send = RSTRING_END(str);
 
@@ -6666,7 +6666,7 @@ rb_str_downcase_bang(int argc, VALUE *argv, VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L6666
     str_modify_keep_cr(str);
     enc = STR_ENC_GET(str);
     rb_str_check_dummy_enc(enc);
-    if (((flags&ONIGENC_CASE_ASCII_ONLY) && (enc==rb_utf8_encoding() || rb_enc_mbmaxlen(enc)==1))
+    if (((flags&ONIGENC_CASE_ASCII_ONLY) && (rb_enc_mbmaxlen(enc)==1))
 	|| (!(flags&ONIGENC_CASE_FOLD_TURKISH_AZERI) && ENC_CODERANGE(str)==ENC_CODERANGE_7BIT)) {
         char *s = RSTRING_PTR(str), *send = RSTRING_END(str);
 
-- 
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