Locale/language-sensitive case mapping (Turkish case folding)

[ozgur-yalcin]

If you care a whit about internationalization (i18n), force your code to run under the Turkish locale as soon as reasonably possible.

Please add localized case folding support like golang:

GO case folding
https://golang.org/pkg/strings/#ToLowerSpecial
https://golang.org/pkg/strings/#ToUpperSpecial

I can suggest test code below for Turkish.

fn test_turkish_case() {
	lower := 'abcçdefgğhıijklmnoöprsştuüvyz'
	upper := 'ABCÇDEFGĞHIİJKLMNOÖPRSŞTUÜVYZ'
	for i, c in lower {
		assert c == upper[i]
	}
}

Vlang has a dreamy syntax and features. I have no doubt that the Turks will be very excited when they discover this language. You don't want to deprive them of this feature :)

[medvednikov]

You can be sure that all languages will be supported, just like in Go :)

[noraj]

Related: rust-lang/rust#72966