Consider base comparator behavior as separate package

[Majkl578]

Currently signature comparisons are hardcoded here.
Would be nice to make them reusable so maybe tools like PHPStan can reuse it later. Just an abstract API like compareMethods($a, $b) etc.

[Ocramius]

@Majkl578 this is already being worked on (for example in #38).

[Majkl578]

That is not a separate package (not what I asked/proposed).

[Ocramius]

Then there's some misunderstanding: I wouldn't make a separate package for well-known comparisons, but I am indeed making interfaces for all (most relevant) comparisons.