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[artgoldberg]

As of Python 3.7, Python's parsing of PEP 526 type annotations does not report replicated attributes properly. A replicated attribute name with default value(s) is not consistent in namespace and namespace['__annotations__']. namespace['__annotations__'] contains the attribute's last type BUT its order there reflects its FIRST declaration. And namespace contains the attribute's LAST default value. This example illustrates the problem, with EventMessage defined below.

class ExampleEventMessageWithReplicatedAttr(EventMessage):
    name: str = 'hi'
    unit_price: float
    quantity_on_hand: int = 0
    name: float = 1.1
    name: int