Compares two safe_int values by their wrapped underlying values.
safe_int
Declared in <mp-units/utility/safe_int.h>
<mp-units/utility/safe_int.h>
[[nodiscard]] constexpr std::strong_ordering operator<=>( safe_int lhs, safe_int rhs) noexcept;
the ordering of the wrapped values
The return value should not be discarded.