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Issue #3033 resolved
>>> 0.5.__round__(None) 0 >>>> 0.5.__round__(None) Traceback (most recent call last): File '<stdin>', line 1, in <module> TypeError: 'NoneType' object cannot be interpreted as an integer
I’m not sure if this is a specified behavior of both CPython (in that ndigits can be None in the
__round__ magic method) and PyPy (in that None counts as “invalid arguments” as mentioned from differences from CPython document).