[issue20416] Marshal: performance regression with versions 3 and 4

[STINNER Victor]

STINNER Victor added the comment:

Except of the minor suggestion that I added on the review, the patch looks good the me. It's quite simple and makes dumps() 34% faster (for protocol 4).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20416>
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