marshalling: fix crash while trying to serialise field of type Optional[List[...]] #77
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…nal[List[...]]` This happened because we didn't use erased types when constructing Schema, so isinstance choked on it. In addition, early detect when we have types like `Union[List[TypeA], List[TypeB]]` -- these aren't distinguishable in runtime, so not much we can do apart from throwing error.
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