Serhiy Storchaka added the comment:

Oh, and passing arguments to this function is tricky. If faked 
unicodedata.normalize save the args tuple it will see a mutated tuple 
containing a hanging reference.

This is a good opportunity of using the fast call protocol.

----------
nosy: +benjamin.peterson, brett.cannon, haypo, ncoghlan, serhiy.storchaka, 
yselivanov

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<https://bugs.python.org/issue31592>
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