Issue #19532 has been updated by nagachika (Tomoyuki Chikanaga).
Backport changed from 2.7: UNKNOWN, 3.0: REQUIRED, 3.1: DONE, 3.2: REQUIRED to 2.7:
UNKNOWN, 3.0: REQUIRED, 3.1: DONE, 3.2: DONE
ruby_3_2 4e0653db3315e9e7859e38e0995e2b9900471370 merged revision(s)
2c8f2871a8aeff592369a993b1d69557160cfa61.
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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-103955
* Author: Eregon (Benoit Daloze)
* Status: Closed
* 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: DONE, 3.2: DONE
----------------------------------------
```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
--
https://bugs.ruby-lang.org/