Abacn commented on issue #33802:
URL: https://github.com/apache/beam/issues/33802#issuecomment-4491234780
> looks like frozenset is not in the supported list and thus would fallback
to pickling, is that correct?
That's true
```
>>> coder=typecoders.registry.get_coder(object)
>>> a=frozenset(['a','b','c'])
>>> coder.encode(a)
b'\xff\x80\x05\x95\x10\x00\x00\x00\x00\x00\x00\x00(\x8c\x01c\x94\x8c\x01a\x94\x8c\x01b\x94\x91\x94.'
```
Note the first byte '\xff' indicates the following is encoded by PickleCoder
and set is handled differently:
```
>>> b = set({'c', 'a', 'b'})
>>> coder.encode(b)
b'\x08\x03\x04\x01c\x04\x01a\x04\x01b'
```
I think it's simply frozenset isn't handled specially by FastPrimitiveCoder.
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