I ran into an issue sooner today when I serialized a data class that contained an enum, and the hashcode was always different

Could you provide a sample which shows that behavior?

I'll try to make one. Basically, what I was doing is something like this:

var code = 6
code = 31 * code + javaLocalDate.hashCode()
code = 31 * code + MyEnum.Foo.hashCode()   // I didn't overwrite this enum
return code

Or do you mean that you're serializing an enum and after deserializing it in a different process it gets different

hashCode

? In that case it is normal, nothing in hashCode spec implies it should preserve its value in across processes.

I think that's closer to what I meant.