Comment #1 on issue 3670 by scmtools repository unique constraint path:local prevents using mysql 5.5 with wide charsets

Hey Thom,

That error isn't about the key length. Actually, that error is old and the specific case it was referring to was fixed long ago. We just never removed the comment.

I don't think we can support utf32 or utf8mb4. Is there a reason plain ol' utf8 can't be used?

The reason is that MySQL's design involving key lengths is completely busted. It does not care about the character length of fields. It will deal exclusively with byte length. That means that the more bytes required per character, the closer you are to hitting that error. We cannot ensure that our key lengths will work for anything higher than utf8.

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