Thanks Graham Wideman for the patch.

Thanks Graham Wideman for the patch.

Forward port of 5234c993 from stable/1.9.x

Avoided unnecessary list operations and delattr() calls that result
in an exception being raised as it causes call frame reconstruction
which is very costly, especially so in a function that is called
millions of times.

The original intent in refs #20536 was to use the highest protocol.
Calling zlib.compress() with a compression level of -1 seems to
fall back to the default level of 6.

Thanks Fako Berkers for help with the patch.

This reverts commit 49eee842 as it caused
a regression with test mirrors.

mysqlclient 1.3.7 fixes the test failures caused by 1.3.6.

A @font-face declaration may contain a fragment that looks like a relative path,
e.g. @font-face { src: url('../fonts/font.svg#../path/like/fragment'); }
In this case, an incorrect path was passed to the storage backend, which raised
an error that caused collectstatic to crash.

Thanks Aymeric for the initial patch and Carl for review.