[issue28494] is_zipfile false positives

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

it's a bugfix, it seems reasonable for 3.7 to me.  I agree that the previous is_zipfile check is too lenient.  I'll follow up on jjolly's PR for any specific concerns I have with the implementation.

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assignee: serhiy.storchaka -> gregory.p.smith

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28494>
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