fix ENV.keys encoding on windows

YO4 · hsbt · commit 239a472609db · 2026-07-24T17:31:45.000+09:00
Fix the encoding of ENV.keys elements to UTF-8 on windows.
They contain UTF-8 byte sequences with locale encoding.
diff --git a/hash.c b/hash.c
@@ -5731,7 +5731,7 @@ env_aset(VALUE nm, VALUE val)
 static VALUE
 env_keys(int raw)
 {
-    rb_encoding *enc = raw ? 0 : rb_locale_encoding();
+    rb_encoding *enc = raw ? 0 : env_encoding();
     VALUE ary = rb_ary_new();
 
     ENV_LOCKING() {

Original file line number	Diff line number	Diff line change
`@@ -5731,7 +5731,7 @@ env_aset(VALUE nm, VALUE val)`
`5731`	`5731`	`static VALUE`
`5732`	`5732`	`env_keys(int raw)`
`5733`	`5733`	`{`
`5734`		`- rb_encoding *enc = raw ? 0 : rb_locale_encoding();`
	`5734`	`+ rb_encoding *enc = raw ? 0 : env_encoding();`
`5735`	`5735`	`VALUE ary = rb_ary_new();`
`5736`	`5736`
`5737`	`5737`	`ENV_LOCKING() {`