[boost] Re: Decimal Library re-review begins today

See note 1 on https://eel.is/c++draft/hash.requirements

Equal values MUST produce the same hash value - if two values of a given type that compare equal could produce different hash values then that would render such a type effectively unusable as a key in hash-based associative containers.

I will make the changes. https://github.com/cppalliance/decimal/issues/1120 Matt