Fix issue with self joins and includes #1275
Merged
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Our polyamorous monkeypatches were doing too much. Removing our custom equality and letting ActiveRecord figure it out seems to do the trick and fix this.
On some Rails & DB adapters this seems to break a polyamorous spec. However, this spec just tests an implementation detail but it's unclear whether the spec breaking has any actual bad side effect in real like, so I removed it.
Fixes #1271.