The following should show the problem:
sage: from sage.structure.unique_representation import UniqueRepresentation
:
: class A(UniqueRepresentation):
: def __init__(self, v=1):
: self.v = str(v)
:
: A() == A()
: A() is A()
: A() == A(1)
True
True
False
At https://github.com/sagemath/sage/pull/37220 I am trying to provide a
construction functor for symmetric functions. I am hitting the following
bug, which I hope is easy to fix if one knows the right magic:
sage: P. = QQ[]
sage: S = SymmetricFunctions(P)
sage: S.jack().P() == S.jack(t=t).P()
