[ruby-core:102062] [Ruby master Bug#17517] File.expand_path returns us-ascii when both arguments are ascii compat

Issue #17517 has been updated by nobu (Nobuyoshi Nakada).


https://github.com/ruby/ruby/pull/4061

----------------------------------------
Bug #17517: File.expand_path returns us-ascii when both arguments are ascii compat
https://bugs.ruby-lang.org/issues/17517#change-89923

* Author: znz (Kazuhiro NISHIYAMA)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Is this intentional?

```ruby
p __dir__.encoding  #=> #<Encoding:UTF-8>
p 'hoge'.encoding   #=> #<Encoding:UTF-8>
p File.expand_path('hoge', __dir__).encoding #=> #<Encoding:US-ASCII>
```

```
% docker run -it --rm ghcr.io/ruby/all-ruby env ALL_RUBY_SINCE=ruby-1.9 ./all-ruby -e 'p File.expand_path("hoge".encode("utf-8"), "/".encode("utf-8")).encoding'
ruby-1.9.0-0        -e:1:in `encode': transcoding not supported (from ASCII-8BIT to UTF-8) (ArgumentError)
                    	from -e:1:in `<main>'
                exit 1
ruby-1.9.0-1        #<Encoding:ASCII-8BIT>
ruby-1.9.0-2        #<Encoding:US-ASCII>
...
ruby-1.9.1-p129     #<Encoding:US-ASCII>
ruby-1.9.1-p243     #<Encoding:UTF-8>
...
ruby-1.9.2-preview1 #<Encoding:UTF-8>
ruby-1.9.2-preview3 #<Encoding:US-ASCII>
...
ruby-3.0.0          #<Encoding:US-ASCII>
```



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