Issue #19532 has been updated by nobu (Nobuyoshi Nakada).
The change itself looks fine, but also I’m for obsoleting CESU-8.
----------------------------------------
Bug #19532: Handling of 6-byte codepoints in left_adjust_char_head in CESU-8 encoding is
broken
https://bugs.ruby-lang.org/issues/19532#change-102463
* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.1 (2023-02-08 revision 31819e82c8) [x86_64-linux]
* Backport: 2.7: UNKNOWN, 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED
----------------------------------------
```ruby
irb(main):001:0> "\u{10000}".encode("cesu-8").chop
=> "\xED\xA0\x80"
```
But it should be `""`.
Fix in
https://github.com/ruby/ruby/pull/7510
--
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