https://issues.dlang.org/show_bug.cgi?id=15440

ag0aep6g@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ag0aep6g@gmail.com

--- Comment #1 from ag0aep6g@gmail.com ---
Here are three Unicode documents and what they say about the lowercase of U+0130. (search for "LATIN CAPITAL LETTER I WITH DOT ABOVE"):

1) <http://www.unicode.org/charts/PDF/U0100.pdf> says: "lowercase is 0069 i".

2) <http://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt> gives U+0069 as the lowercase, too, if I read it right.

3) <http://www.unicode.org/Public/UCD/latest/ucdxml/ucd.nounihan.grouped.zip> gives 'slc="0069" lc="0069 0307"'. I assume "slc" means "simple lowercase", and "lc" means "lowercase".

So it seems that the "simple lowercase" is 'i', but the proper(?) lowercase is
"\u0069\u0307".

That makes sense when it's supposed to be reversible without assuming a Turkish context. Uppercasing "\u0069\u0307" you get "\u0049\u0307" ('I' + combining dot) which is equivalent to "\u0130".

Seems to me that std.uni is playing by the book, and that there's a point in what the book says. But I don't know enough about Unicode to speak with certainty.

--

https://issues.dlang.org/show_bug.cgi?id=15440

Jack Stouffer <jack@jackstouffer.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--

https://issues.dlang.org/show_bug.cgi?id=15440

ag0aep6g@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |INVALID

--- Comment #2 from ag0aep6g@gmail.com ---
Changing the resolution to INVALID. As far as I know, the changelog lists all FIXED issues, and this shouldn't be in the changelog, because we didn't actually change anything.

--

https://issues.dlang.org/show_bug.cgi?id=15440

Ali Cehreli <acehreli@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |acehreli@yahoo.com

--- Comment #3 from Ali Cehreli <acehreli@yahoo.com> ---
It looks like I am outdated on this issue because I had never heard of the 0069 0307 sequence before H. S. Teoh brought the following change to my attention:

  https://github.com/D-Programming-Language/phobos/pull/3848

I've learned since then that the two-character sequence should be the default but TR locale should still use just 0069. According to the following quote, Java 7 behaves differently depending on locale:

  http://grepalex.com/2013/02/14/java-7-and-the-dotted--and-dotless-i/

<quote>
CODE       LOWER   TITLE   UPPER  LANGUAGE
0130;  0069 0307;   0130;   0130;
0130;  0069;        0130;   0130;       tr;
0130;  0069;        0130;   0130;       az;

Entries with a language take precedence over those without, so in my JVM where
the default locale is English, the first row of the mapping is used, which
lines-up with the codepoints that we saw outputted in our Java 7 example.
Therefore to make Java do the right thing here for Turkish, we need to
explicitly specify the Turkish locale (“tr” is the ISO 639 alpha-2 language
code for Turkish) to the toLowerCase method
</quote>

Should std.uni be locale-aware?

--

https://issues.dlang.org/show_bug.cgi?id=15440

--- Comment #4 from Jack Stouffer <jack@jackstouffer.com> ---
(In reply to Ali Cehreli from comment #3)
> Should std.uni be locale-aware?

Yes, though in what way it would achieve this is an interesting question.

I think you should make a seperate bug report for this.

--