[ruby-core:126155] [Ruby Bug#20958] fix ENV.keys encoding on windows

24 Jul 2026

      Issue #20958 has been updated by hsbt (Hiroshi SHIBATA).

Status changed from Open to Closed

https://github.com/ruby/ruby/pull/12368 has been merged. Thanks!

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Bug #20958: fix ENV.keys encoding on windows
https://bugs.ruby-lang.org/issues/20958#change-118211

* Author: YO4 (Yoshinao Muramatsu)
* Status: Closed
* Assignee: windows
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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[github PR#12368](https://github.com/ruby/ruby/pull/12368)
ENV.keys elements contain UTF-8 byte sequences with locale encoding on Windows.
```
...
ruby -v -e "p ENV.keys.last; p ENV.keys.last.encoding; p ENV.keys.last.dup.force_encoding('utf-8')"
ruby 3.3.5 (2024-09-03 revision ef084cc8f4) [x64-mingw-ucrt]
"\x{E383}\x{86E3}\x{82B9}\x{E383}\x88"
#<Encoding:Windows-31J>
"テスト"
This patch changes the encoding of ENV.keys to utf-8 on Windows.

-- 
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