[BUG] transliterating all-caps strings ends up with mixed case

[padde]

What I tried to do

I want to transliterate an all-caps string

I18n.transliterate("KANÜLE")

What I expected to happen

I expect all resulting characters to be capitalized

#=> "KANUELE"

What actually happened

The resulting characters are mixed case

#=> "KANUeLE"

Simply changing the entries in the translations file to "Ü": "UE" works for this case, but then of course mixed case words will be transliterated in a wrong manner:

I18n.transliterate("Überfall")
#=> "UEberfall"

I would expect a solution that can handle both cases gracefully.

Versions of i18n, rails, and anything else you think is necessary

All versions of i18n