<mp-units/framework/quantity_spec_concepts.h>
template<
typename T,
auto QS>
concept QuantitySpecOf = QuantitySpec<T> && QuantitySpec<MP_UNITS_REMOVE_CONST(decltype(QS))> && (mp_units::implicitly_convertible(T{}, QS));
Satisfied by all quantity specifications that are implicitly convertible to the provided QS
value.