cattrs

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Pyright flags the code below with "Type of "make_converter" is partially unknown".

converter = cattrs.preconf.json.make_converter()

The problem is the type of the parameter unstruct_collection_overrides: Mapping[type, (...) -> Unknown].

Poking around in the cattrs code, this error can be resolved by changing the type of unstruct_collection_overrides in Converter.Init from

unstruct_collection_overrides: Mapping[type, Callable] = {}

to unstruct_collection_overrides: Mapping[type, UnstructureHookT] = {}