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I can understand that the current behaviour can be correct in regard with the added attributes of the object. However, should I open a new issue for the following inheritance behaviour which the reduce function affects also.
class myCounter(Counter):
 def __init__(self, bar, *args):
 self.foo = bar
 super().__init__(*args)
class myDict(dict):
 def __init__(self, bar, *args):
 self.foo = bar
 super().__init__(*args)
c = myCounter("bar")
l = myDict("bar")
print(c.foo) # prints bar
print(l.foo) # prints bar
cc = copy.copy(c)
ll = copy.copy(l)
print(cc.foo) # prints {}
print(ll.foo) # prints bar