From: "Martin J. Dürst" <duerst@...>
Date: 2016-06-06T19:08:31+09:00
Subject: [ruby-core:75858] Re: Important: Somewhat backwards-incompatible change (Fwd: [ruby-cvs:62388] duerst:r55225 (trunk): * string.c: Activate full Unicode case mapping for UTF-8)

There was some hickup with tests, but since r55277, this is now for 
real. I just added UTF-16BE/LE and UTF-32BE/LE to the suppported 
encodings, too.

Regards,    Martin.

On 2016/05/31 10:25, Martin J. D��rst wrote:
> With the change below, I have activated full Unicode case mapping for
> UTF-8 in trunk. This is may create minor incompatibilities.
>
> Essentially, up to r55224, you get:
>
> 'r��sum�� ������������������������������������������'.upcase
>                         # -> 'R��SUM�� ������������������������������������������'
>
> Starting with r55225, you get:
>
> 'r��sum�� ������������������������������������������'.upcase
>                         # -> 'R��SUM�� ������������������������������������������'
>
> In general, the later is highly desirable, and that's why Matz
> explicitly proposed it (https://bugs.ruby-lang.org/issues/10085#note-5).
>
> However, there are some exceptions. For example, DNS servers only match
> ASCII case-insensitively, but otherwise is case-sensitive. So to match,
> you want to case-map only ASCII
> (https://bugs.ruby-lang.org/issues/10085#note-9). You can do that now with
>
> 'r��sum�� ������������������������������������������'.upcase(:ascii)
>                         # -> 'R��SUM�� ������������������������������������������'
>
> So if you have code that needs such behavior, please add the :ascii
> option (it's not needed if you know that all your data is ASCII anyway).
>
> You can find documentation of the various options in the String#downcase
> documentation, but they apply to all casing methods
> (upcase/downcase/capitalize/swapcase).
>
> Implementations for encodings other than UTF-8 will follow (hopefully
> soon).
>
> Regards,   Martin.
>
> -------- Forwarded Message --------
> Subject: [ruby-cvs:62388] duerst:r55225 (trunk): * string.c: Activate
> full Unicode case mapping for UTF-8 by removing
> Date: Tue, 31 May 2016 01:10:07 +0000
> From: duerst@ruby-lang.org
> To: ruby-cvs@ruby-lang.org
>
> duerst    2016-05-31 10:10:06 +0900 (Tue, 31 May 2016)
>
>   New Revision: 55225
>
>   https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=55225
>
>   Log:
>     * string.c: Activate full Unicode case mapping for UTF-8 by removing
>       the protective check for the presence of an option.
>       Update documentation.
>     * test/ruby/enc/test_case_comprehensive.rb: Adjust tests for above
> change.
>
>   Modified files:
>     trunk/ChangeLog
>     trunk/string.c
>     trunk/test/ruby/enc/test_case_comprehensive.rb
> .
>
>
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