I'm afraid this one is going to be declined, one of the rules for libraries in contrib is that they only depend on other libraries in contrib or on libraries in the core purescript organisation.

@garyb Got it, I'm very new to Purescript and that rule somehow evaded my attention.
Because orphaned typeclass instances are not allowed in Purescript, that severely limits usability of "generic" libraries (eq, generic datastructures, like purescript-unordered-collections) not in contrib packages.
I will try to discuss it on Discord, it seems like the correct way forward is to include purescript-unordered-collections in contrib, so I'm curious what are the blockers for that.

That's one option for sure, but ideally it would be nice to get the stuff sorted out so we have Hashable in the prelude too.