Should std::expected<void, T> be supported from pybind11?

[Lorac]

Those static assert currently fails and requires specialization. We are using std::expected<void, std::string> for error handling with error messages, and we noticed that it didn't seem to be supported out of the box.

static_assert(pybind11::detail::is_copy_constructible<std::expected<void, std::string>>::value);
static_assert(pybind11::detail::is_move_constructible<std::expected<void, std::string>>::value);

I'm not a meta-programming expert, but I think it fails because it deduces that void is not copyable nor movable, but for std::expected, it doesn't matter.