Proper type hints for @metric_scope decorator to work nicely with mypy #70
+6
−3
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When using @metric_scope on a typed function, mypy produces this kind of error:
error: Untyped decorator makes function "handler" untyped
This fix avoid this error and will let people using typehint now having those kind
of error messages.
See https://mypy.readthedocs.io/en/stable/generics.html#declaring-decorators
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