Provide a drop-in replacement for UniqueRepresentation, that only provides equality.

[mantepse]

Problem Description

As pointed out by @nbruin many times, in particular in #25388 (comment), and as witnessed in #38904, there are drawbacks to using UniqueRepresentation. At the very least it makes parent creation more expensive.

Proposed Solution

We provide a drop in replacement for UniqueRepresentation, that saves us from re-implementing equality.

For example, Partitions is a class that currently inherits from UniqueRepresentation. However, it is completely unclear for which applications this may be beneficial.

Alternatives Considered

Alternatively, we could just implement equality of the parents case by case. This might be still better performance-wise, but would be much more work. Additionally, it may be helpful to state almost explicitly, by inheriting from the proposed class, that we do not wish to use UniqueRepresentation.

Additional Information

No response

Is there an existing issue for this?

• I have searched the existing issues for a bug report that matches the one I want to file, without success.