[abustamam]

I don't quite follow your reasoning. All bugs are (usually) unintentional and created by the programmer.

[pintxo]

By not using special chars in the first place, you can be sure you will not be able to run into any (unintentional) bugs later.

And not using special chars is cheap, as by requiring a min-length of 13 instead of 12, you can get an even greater level of security.

[abustamam]

Got it, thanks! That makes sense.