gh-155324: Pickle frozendict with all protocols - #155325
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frozendict only defined __getnewargs__, so pickling raised TypeError at protocols 0 and 1. Give it a __reduce__ mirroring frozenset.
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frozendictonly defined__getnewargs__, so pickling raisedTypeErroratprotocols 0 and 1 (which do not use it); protocols 2 to 5 worked. Give
frozendicta__reduce__mirroringfrozenset, so it pickles at everyprotocol, including a subclass's instance state.