Declared in <mp-units/framework/quantity_point.h>
template<UnitOf<quantity_spec> U>
requires (PO == default_point_origin(R)) && detail::ImplicitScaling<unit, U{}, rep>
[[nodiscard]]
constexpr
RepresentationOf<quantity_spec> auto
numerical_value_in(U) const noexcept;
The return value should not be discarded.