Hash value for ArraySet is order-dependent: https://github.com/mongodb/mongo/blob/ad8894ae07b93c175e90f992e517160f286c328c/src/mongo/db/exec/sbe/values/value.cpp#L460
So we can have equal sets with different hash values. This basically breaks hash sets and hash maps if ArraySet is used as a key.

It actually can cause queries to produce wrong results if $group uses ArraySet as _id.