[issue43625] CSV has_headers heuristic could be improved

[Skip Montanaro]

Skip Montanaro <skip.montanaro at gmail.com> added the comment:

Here is a change to the has_header documentation and an extra test case documenting the behavior when the sample contains strings. I'm not sure about the wording of the doc change, perhaps you can tweak it? Seems kind of clumsy to me. If it seems okay to you @andrei.avk, can you fold it into your PR?

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Added file: https://bugs.python.org/file50131/hasheader.diff

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