Drop Python 3.7 handling for pickle protocol 4 #12857
Merged
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Description
Fixes #12851
Now that Python 3.8 is the minimum supported version, drop the special casing for Python 3.7's
HIGHEST_PROTOCOL
, which was 4 (not 5). In Python 3.8+,HIGHEST_PROTOCOL >= 5
. So none of these branches are needed any more.Checklist