Could this be the behaviour of passing in an Ellipsis? e.g.
def foo(defaults_to_one=1):
return defaults_to_one
assert foo(...) == foo()
def bar(something=...):
return foo(something)
assert bar() == foo()
def baz(arg): # no defaults
return arg
assert baz(...) == ...
The only place that I am aware of the Ellipsis being used is in index notation
(numpy).
So this would have likely an impact on __getitem__ or the slice object.
*Alternatively* a subtype of Ellipses specifically for when used in argument
defaults DefaultEllipsis (or equivalent):
def foo(x=...):
return x
assert isinstance(foo(), EllipsisType)
assert foo() != Ellipsis
assert isinstance(foo(...), EllipsisType)
assert foo(...) == Ellipsis
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