[issue40825] Add a "strict" parameter to csv.writer and csv.DictWriter

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

I guess an isinstance check against numbers.Number would be the best way to check if an argument is a number. I'm not sure how convenient that is from C code.

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<https://bugs.python.org/issue40825>
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