[issue30468] Propagate zipfile.py pypy issue #905 patch to CPython 3.7

[Alecsandru Patrascu]

Alecsandru Patrascu added the comment:

Serhiy, I am curious why did you have chosen to compute the CRC32 table everytime? It is standard (the generator polynomial does not change) and always will output the same values. And it is also less computational intensive to loading a precomputed array vs calculating it each time a zip archive is extracted.

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nosy: +alecsandru.patrascu

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