A modern programming language that makes developers happier.

kotlinlang

i'm kinda stuck with the ^ issue. also, i'm looking at Cat's implementation, they sometimes use `hashCode()` and sometimes hash with util functions, <https://github.com/typelevel/cats/blob/1.0/kernel/src/main/scala/cats/kernel/instances/StaticMethods.scala>. it's not clear to me why and when `hashCode` is not good enough. any thought?

and if we need the util hash functions, where should i put they in? what's the best place for these utils?