From: "fablestales (Fable Tales) via ruby-core" <ruby-core@...>
Date: 2024-02-26T18:58:26+00:00
Subject: [ruby-core:116960] [Ruby master Bug#20305] commit 1d2d25dcadda0764f303183ac091d0c87b432566 breaks grapheme_clusters

Issue #20305 has been reported by fablestales (Fable Tales).

----------------------------------------
Bug #20305: commit 1d2d25dcadda0764f303183ac091d0c87b432566 breaks grapheme_clusters
https://bugs.ruby-lang.org/issues/20305

* Author: fablestales (Fable Tales)
* Status: Open
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
given a script:
```
#script.rb
p "������".byteslice(0, 4).grapheme_clusters
```

The commit 1d2d25dcadda0764f303183ac091d0c87b432566 (https://github.com/ruby/ruby/commit/1d2d25dcadda0764f303183ac091d0c87b432566) breaks the grapheme_clusters method on a byte slice

```
(commit 1d2d25dcadda0764f303183ac091d0c87b432566)
 ((HEAD detached at 1d2d25dcad)) $ ./ruby --disable=gems script.rb
["���", "\xEB"]
 ((HEAD detached at 1d2d25dcad)) $ git checkout HEAD^
(114e71d06280f9c57b9859ee4405ae89a989ddb6)
 ((HEAD detached at 114e71d062)) $ make -j
...
 ((HEAD detached at 114e71d062)) $ ./ruby --disable=gems script.rb
["���"]
 ((HEAD detached at 114e71d062)) $ cat script.rb
p "������".byteslice(0, 4).grapheme_clusters
```


the expected result here is almost certainly the latter output, and not the former.



-- 
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