[#102652] [Ruby master Bug#17664] Behavior of sockets changed in Ruby 3.0 to non-blocking — ciconia@...
Issue #17664 has been reported by ciconia (Sharon Rosner).
23 messages
2021/02/28
[ruby-core:102361] [Ruby master Bug#17594] Sort order of UTF-16LE is based on binary representation instead of codepoints
From:
daniel@...42.com
Date:
2021-02-01 15:25:04 UTC
List:
ruby-core #102361
Issue #17594 has been updated by Dan0042 (Daniel DeLorme).
I agree that real high-quality string sorting requires a specialized library, but there's no need to aim so high here. Perfect is the enemy of good. I think it would be good to have a minimum level of consistency between Unicode encodings.
Or maybe per-codepoint ordering could be only for casecmp? Since it already has a different order from case-sensitive sort anyway...
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Bug #17594: Sort order of UTF-16LE is based on binary representation instead of codepoints
https://bugs.ruby-lang.org/issues/17594#change-90222
* Author: Dan0042 (Daniel DeLorme)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
I just discovered that string sorting is always based on bytes, so the order of UTF-16LE strings will give some peculiar results:
```ruby
BE, LE = 'UTF-16BE', 'UTF-16LE'
str = [*0..0x4ff].pack('U*').scan(/\p{Ll}/).join
puts str.encode(BE).chars.sort.first(50).join.encode('UTF-8')
#abcdefghijklmnopqrstuvwxyzµßàáâãäåæçèéêëìíîïðñòóôõ
puts str.encode(LE).chars.sort.first(50).join.encode('UTF-8')
#āȁăȃąȅćȇĉȉċȋčȍďȏđȑēȓĕȕėȗęșěțĝȝğȟġȡģȣĥȥħȧĩȩīȫĭȭįȯаı
'a'.encode(BE) < 'ā'.encode(BE) #=> true
'a'.encode(LE) < 'ā'.encode(LE) #=> false
```
Is this supposed to be correct? I mean, I somewhat understand the idea of just sorting by bytes, but I find the above output to be remarkably nonsensical.
A similar/related issue was found and fixed in #8653, so there's precedent for considering codepoints instead of bytes.
The reason I'm asking is because I was working on some optimizations for `String#casecmp` (https://github.com/ruby/ruby/pull/4133) which, as a side-effect, sort by codepoint for UTF-16LE. And that resulted in a different order for `<=>` vs `casecmp`, and thus some tests broke. But I think sorting by codepoint would be better in this case.
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