Details
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Improvement
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Status: Resolved
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P2
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Resolution: Fixed
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None
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None
Description
When Beam attempts to convert a type hint like `typing.Tuple[PCollection[int], PCollection[int]]` it will fail in Python 3.7+ with something like:
TypeError: Parameter to List hint must be a non-sequence, a type, or a TypeConstraint. PCollection[int] is an instance of _GenericAlias.
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