[issue31141] Start should be a keyword argument of the built-in sum

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> I don't think it is worth to allow passing the first argument as a keyword argument.

I concur. Would you mind to add a test to make sure that passing the first argument as the "iterable" keyword doesn't work?

"iterable" name comes from the Doc/library/functions.rst documentation and from the docstring.

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nosy: +vstinner

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