[issue34749] improve performance of binascii.a2b_base64()

[Sergey Fedoseev]

Change by Sergey Fedoseev <fedoseev.sergey at gmail.com>:


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keywords: +patch
pull_requests: +8859
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34749>
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