ADTs hashes are non unique

[albertocalderari]

Lets say I have an ADT defined as:

@adt
class Foo:
        BAR = Case[str]
        BAZ = Case[str]

CAsting a list of adts as a set:

set([BAR("1"), BAR("1"), BAZ("1")])

will return:

set(BAR("1"), BAR("1"), BAZ("1"))

instead of:

set([BAR("1"), BAZ("1")])