Message 299298 - Python tracker

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Content 
In the documentation:

   For a general Python object ``number``, ``round(number, ndigits)`` delegates to
   ``number.__round__(ndigits)``.

Mark, is it worth to mention explicitly that round(number) and round(number, None) delegate to
number.__round__()?

The custom __round__() method should support calling without the argument, but it can not support calling with None.