puzzlers of a primitive kind

On Oct 25, 2009, at 24:56, Paul Phillips wrote:

> Bringing the GenericRange thread together with equality, here's a fun
> one for the "overloading ==" plan:
>
> % scala -Yfuture-eqeq
>
> scala> List(1L, 2L) contains 1
> res0: Boolean = false
>
> scala> Set(1L, 2L) contains 1
> res1: Boolean = true
>
> Loyal followers of the equality saga will understand why this is,
> but of
> more immediate concern is: can such a thing be tolerated?
>

Practitioner's Report: Not in the real world of today, IMHO.