[ruby-dev:51079] [Ruby master Bug#12052] String#encode with xml option returns wrong result for totally non-ASCII-compatible encodings

Issue #12052 has been updated by nagachika (Tomoyuki Chikanaga).


The multiple GitHub Actions environments show the failure of make check.
The error messages are all the same.

Ubuntu: https://github.com/ruby/ruby/runs/2977522707
macOS: https://github.com/ruby/ruby/runs/2977522761
MinGW: https://github.com/ruby/ruby/runs/2977522628

```
  1) Failure:
TestTranscode#test_encode_xml_multibyte [/home/runner/work/ruby/ruby/src/test/ruby/test_transcode.rb:140]:
failed encoding UTF-16LE to UTF-16LE with xml: :text.
<"&lt;&gt;"> expected but was
<"&lt;\u0000&gt;\u0000">.
```


----------------------------------------
Bug #12052: String#encode with xml option returns wrong result for totally non-ASCII-compatible encodings
https://bugs.ruby-lang.org/issues/12052#change-92757

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Priority: Normal
* Assignee: akr (Akira Tanaka)
* Backport: 2.7: REQUIRED, 3.0: REQUIRED
----------------------------------------
`String#encode`をASCII非互換エンコーディングから同じエンコーディングへ、`xml:`オプション付きで呼ぶとおかしな結果を返します。
バイナリとして変換してしまっているようです。

```ruby
p "<\0>\0".encode("utf-16le", "utf-16le", xml: :text)
#=> "\u6C26\u3B74\u2600\u7467;"
```



-- 
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