Perform two passes in the variant caster #769
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When converting a Python object that wraps a `T` to a `std::variant<U,T>`, where `U` is implicitly convertible from `T`, the variant caster will cast to the `U` (even though the Python object is definitely a `T`) The included test case demonstrates the issue. pybind11 does two pass conversion in this case. One can work around the issue by using `noconvert()` on the argument. But it seems that it would be a friendlier default to make type conversions in a variant work as expected.
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When converting a Python object that wraps a
Tto astd::variant<U,T>, whereUis implicitly convertible fromT, the variant caster will cast to theU(even though the Python object is definitely aT)The included test case demonstrates the issue. pybind11 does two pass conversion in this case. One can work around the issue by using
noconvert()on the argument. But it seems that it would be a friendlier default to make type conversions in a variant work as expected.