An equality operator for `LogicValues` that supports "don't care"

[mkorbel1]

Motivation

There are cases where you want to compare two LogicValues values for some bits, but not all bits. It would be nice to support an equality check that enables a comparison of two LogicValues where any x is treated as a "don't care if this bit is equal". Some thought would need to be put into whether only one side of the comparison should consider x as don't care or both sides, or maybe that should be configurable. This feature is similar to a casez but for values instead of hardware.

Desired solution

Add a function for comparison with don't care to LogicValues.

Alternatives considered

Let users implement this functionality themselves as needed.

[mkorbel1]

Comparison operator could also do things like compare a bus full of "x" to LogicValue.x with some sort of "fill" mechanism

[dmetis]

I would like to take this one.