On Nov 30, Irmen de Jong opened a tracker issue with a patch improve
bytearray pickling.
http://bugs.python.org/issue13503
Yesterday, Dec 5, Antoine Pitrou applied a revised fix.
http://hg.python.org/cpython/rev/e2959a6a1440/
The commit message:
"Issue #13503: Use a more efficient reduction format for bytearrays with
pickle protocol >= 3. The old reduction format is kept with older
protocols in order to allow unpickling under Python 2."
--
Terry Jan Reedy
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