Jeroen Demeyer <j.deme...@ugent.be> added the comment:

You are correct that PyDict_Merge() does not need to recompute the hashes of 
the keys. However, your example doesn't work because you need string keys for 
**kwargs. The "str" class caches its hash, so you would need a dict with a 
"str" subclass as keys to hit that problem.

I think that calling d.update(**kw) with kw having str-subclass keys should be 
very rare. I'm not sure that we should care about that.

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<https://bugs.python.org/issue29312>
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