Bool not cast to int when using union passthrough strategy

[danielnelson]

When structuring a bool as an int, the behavior is to convert it to an int:

converter = cattrs.Converter()
result = converter.structure(True, int)
assert type(result) is int
assert result == 1

But when using configure_union_passthrough structuring to a union, it doesn't get converted and remains a bool:

converter = cattrs.Converter()
cattrs.strategies.configure_union_passthrough(Union[int, bool, float, str, None], converter)
result = converter.structure(True, Union[int, float])
assert type(result) is bool
assert result

My expectation was that it would be converted to an int in both cases.

This is with cattrs 24.1.2.