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In the last release I added explicit support for `vector<bool>` which wasn't working with libc++ because the iterator's `operator*` returned a proxy reference type. Other implementations return a `bool` for const iterators, so they happened to work okay. This solves the problem in a more general purpose way by instantiating `hash_combine` for the iterator `value_type`. So the type returned by `operator*` will be implicitly casted to the correct type.