I know it seems insane, but Turkish capitalization is not fun to work with as a programmer. When they latinized the alphabet 100 years ago or so, they were short on vowels and so it must have seemed pretty clever and convenient to make i and I separate letters with İ and ı respective case pairs. From a western programmers perspective though it's one of the worst unicode special cases owing to its combined unexpectedness and commonness.

Just as an example, text-transform: uppercase has been broken in Turkish for all major browsers until I believe Firefox finally fixed it late last year, after having a bug open for nearly a decade.