Capital İ and small case i

[mgrohan]

Looking to register a couple of Turkish names but looks like capital 'i' is 'İ', different punycode as the capital is not a ASCII charcter.

Is there any point to use this character in registrations, or is it best to stick to all lower case?

[Drewbert]

Capitals are changed to lower case during string prep.

Or at least, they SHOULD be.

[idn]

Originally Posted by Drewbert

Capitals are changed to lower case during string prep.

Or at least, they SHOULD be.

Not really, unless things have changed. İstanbul.com was parked at Sedo (briefly) and the İ was displayed as an i except with two dots at the top instead of one. You can no longer register the İ, at least anywhere I have tried recently.

[Drewbert]

Hmmm.

It appears to be decomposed into a capital "I" and a "COMBINING DOT ABOVE" (unicode 0307 hex, 775 dec) during string prep and then the capital I is then changed to a small i.

On the way back from punycode to unicode, the change in capitalisation doesn't take place, which makes this a prime phishing opportunity.

[mgrohan]

Found this which helps explain a bit the difficulties with the Turkish i: http://www.i18nguy.com/unicode/turkish-i18n.html

Explains why i've had trouble in the past getting variant errors.

[Drewbert]

Good find. Thanks for the URL.