Compatibility of hash codes between Long and BigInt

[denisrosset]

Here is a small example:

scala> BigInt(-1L).hashCode
res0: Int = -1

scala> (-1L).hashCode
res1: Int = 0

see scala/scala#8526

[sjrd]

You'll want to compare (-1L).## to BigInt(-1L).## for consistent results. hashCode does not honor cooperative equality and hash code.

[denisrosset]

If I get it, (x: AnyRef).## == (x: AnyRef).hashCode, while it differs for the primitive types, right?

[denisrosset]

Corrected the test.

[sjrd]

Yes that's basically right, modulo box classes, which behave like primitives.

[denisrosset]

Closing this as it's not a real issue, thanks @sjrd