> * Functions having the same signature share the same annotation tuple.
Is this true with code that have a mutable default?
>>> def a(arg = []):
... arg.append('a')
... return arg
...
>>> def b(arg = []):
... arg.append('b')
... return arg
...
>>> a()
['a']
>>> a()
['a', 'a']
>>> a()
['a', 'a', 'a']
>>> b()
['b']
>>> b()
['b', 'b']
>>> b()
['b', 'b', 'b']
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