petl-developers / petl / 40727955663

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fix: close ZIP source members before their archives (#773)

This fixes ZIP-backed exports failing when the source context exits.
`ZipSource.open()` opens a member but closes only the archive; Python
refuses to finalize an archive with an open writing member:

Close the member before closing the archive, including when the caller
raises. Retained reader objects are also closed at context exit, so they
no longer keep the archive's file handle open.

Co-authored-by: chivector <200636136+chivector@users.noreply.github.com>
Co-authored-by: Juarez Rudsatz <juarezr@gmail.com>

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