IDL4CPP — is_bounded/bound for none string/sequence typs

it is not clear what the traits is_bounded/bound are for non string/sequence types, for example a long. The spec says the trait is empty, but it is there, what is the value then. When looking at the std traits, it seems better that is_bounded returns false_type (follows https://en.cppreference.com/w/cpp/types/is_bounded_array) and bound returns 0 (follows https://en.cppreference.com/w/cpp/types/rank)