Commented by: @asfernandes

Why? Sources?

For example, Chrome Ctrl+F (text search) searchs in case-/accent-insensitive way.

And it is against your ticket. U+0418 is considered different than U+0419.

Commented by: @pavel-zotov

http://en.wikipedia.org/wiki/Breve

Letter 'Й' is common cyrillic letter 'И' with diacritical mark over it (semi-cirle) which name is 'breve'.

If accent-insensitive collation is that one ignores ACCENTS than why it should behave different for this letter ?

Also: sound when these letters are pronounced ( 'И' (U+0418) and 'Й' (U+0419)) is differ -- but only when 'Й' at **last** position of the word. There is no much problem when this letter occurs in the middle of word is this is COMMON noun.

Problem can be when doing 'sound-based search' of words that containing 'И' or 'Й' in the middle and are NOT from set common nouns, i.e. name of person, city, river etc.

Commented by: Sean Leyne (seanleyne)

Adriano,

"...U+0418 is considered different than U+0419."

To an outsider, if 'Е' (U+0415) and 'Ё' (U+0401) are the same it would seem reasonable that they could be the same. Why do you believe that they are different.

What I find interesting/odd is that 'Е' and 'ё' are the same, they are different cases.

Commented by: @pavel-zotov

> To an outsider, if 'Е' (U+0415) and 'Ё' (U+0401) are the same it would seem reasonable that they could be the same. Why do you believe that they are different.

Currently I speak about ANOTHER pair of letters: 'И' (U+0418) and 'Й' (U+0419) -- they should be compared just like 'Е' (U+0415) and 'Ё' (U+0401) when applying Accent Insensitive collation. IMHO.

> What I find interesting/odd is that 'Е' and 'ё' are the same, they are different cases.

This is because I've applied CASE_insensitive collation also, not only AI.

Commented by: @asfernandes

These are the letter names:

cyrillic capital letter short i (U+0419)
cyrillic small letter short i (U+0439)

cyrillic capital letter i (U+0418)
cyrillic small letter i (U+0438)

cyrillic capital letter io (U+0401)
cyrillic capital letter ie (U+0415)

So, for me, even the 401/415 is not that simple. It's not just an accent.

Since Chrome does as Firebird, I believe this should be reported to ICU tracker instead of Firebird.

Commented by: @dyemanov

IMHO, our behavior is correct. 'Е' (U+0415) and 'Ё' (U+0401) can really be considered equal if compared without accents, recently it became quite common in Russia to write 'Е' instead of 'Ё' in PC-typed texts - formally wrong but absolutely understandable. But 'И' (U+0418) and 'Й' (U+0419) are really different, the former is clear vowel but the latter is more a consonant than a vowel.