[Python-3000] String comparison

["Martin v. Löwis"]

> FWIW, I don't buy that normalization is expensive, as most strings are
> in NFC form anyway, and there are fast checks for that (see UAX#15,
> "Detecting Normalization Forms"). Python does not currently have
> a fast path for this, but if it's added, then normalizing everything
> to NFC should be fast.

That would be useful to have, anyway. Would you like to contribute it?

Regards,
Martin