From: "katiecaballero2023 (Katie Caballero) via ruby-core" <ruby-core@...>
Date: 2023-11-13T19:51:26+00:00
Subject: [ruby-core:115375] [Ruby master Bug#17400] Incorrect character downcase for Greek Sigma

Issue #17400 has been updated by katiecaballero2023 (Katie Caballero).





RubyConf Hack Day: Bug still exists in 3.2.2



----------------------------------------

Bug #17400: Incorrect character downcase for Greek Sigma

https://bugs.ruby-lang.org/issues/17400#change-105308



* Author: xfalcox (Rafael Silva)

* Status: Open

* Priority: Normal

* Assignee: duerst (Martin D��rst)

* ruby -v: ruby 3.0.0dev (2020-12-16T18:46:44Z master 93ba3ac036) [x86_64-linux]

* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN

----------------------------------------

An issue caused by this bug was first reported at Discourse support community at https://meta.discourse.org/t/unicode-username-results-in-error-loading-profile-page/173182?u=falco.



The issue is that in Greek, there are two ways to downcase the letter ��������



 - �������� when it is used at the end of a word

 - �������� anywhere else



NodeJS follows this rule:



```

���  node

Welcome to Node.js v12.11.1.

Type ".help" for more information.

> "������������".toLowerCase()

'������������'

```



Python too:



```

��� python

Python 3.8.2 (default, Nov 23 2020, 16:33:30) 

[GCC 10.2.0] on linux

Type "help", "copyright", "credits" or "license" for more information.

>>> "������������".lower()

'������������'

```



Ruby (both 2.7 and 3) doesn't:



```

���  ruby --version           

ruby 3.0.0dev (2020-12-16T18:46:44Z master 93ba3ac036) [x86_64-linux]

���  irb           

irb(main):001:0> "������������".downcase

=> "������������"

```



```

���  ruby --version

ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]

���  irb

irb(main):001:0> "������������".downcase

=> "������������"

```









-- 

https://bugs.ruby-lang.org/

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