Demonstrate the issue with Dict using a Typed as value.

gistfile1.txt

# -*- coding: utf-8 -*-

from atom.api import Atom, Dict, Str, Typed


class aux(Atom):
    pass


class A(Atom):

    d = Dict(Str(), Typed(aux))


class B(Atom):

    d = Dict(Str(), Typed(aux))

a = A()
a.d = {'a': aux()}

b = B()
b.d = a.d