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How do you reproduce it?  I have seen that exception pop up
when trying to add a file >2GB to an archive (although in
that case it occurred during the call to ZipFile.write
rather than __del__).  It looks to me like writing the
end-of-zip-archive record - during close(), which is called
by __del__() -  would give this exception if the contents of
the archive were > 2GB, but I haven't tried this out to be
sure.  If that's what's causing the problem, then it would
appear to me that it's just a limitation of the ZIP file
format, but maybe the ZipFile object could detect this and
raise a less cryptic exception.