mattalbr commented on issue #33802:
URL: https://github.com/apache/beam/issues/33802#issuecomment-4491133149

   Thank you for the clarification! Is there an easy way to check whether 
FastPrimitivesCoder will fall back to PickleCoder for a given type? From a 
brief perusing of 
https://github.com/apache/beam/blob/master/sdks/python/apache_beam/coders/coder_impl.py#L404
 it looks like `frozenset` is not in the supported list and thus would fallback 
to pickling, is that correct? That's a bit surprising to me given that 
pcollection values are not supposed to be mutated, so I figured using frozenset 
would be best practice rather than set, but perhaps got that exactly backwards


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