Support Literal and Union/Optional types on structs. Fixes #405 #408
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Fixes #405.
In particular, since the type annotations are preserved when calling
.metadata(typed=True)
, they can then be used for runtime validation, which would not be the case if "str" (in the case of Literal) or object (in the case of Union) was used directly, Of course, by using Union one loses the benefits of being able to operate on the data in C++, but this is already true of "object", so the validation capabilities are a strict improvement.