[issue17747] Deprecate pickle fast mode

Changes by Alexandre Vassalotti : -- resolution: -> wont fix stage: needs patch -> committed/rejected status: open -> closed ___ Python tracker ___ _

[issue17747] Deprecate pickle fast mode

New submission from Alexandre Vassalotti: Pickle fast mode is currently a deprecated feature of the Pickler class used to disable its memoization mechanism. It was used mainly to create smaller output by not emitting a PUT opcode for each object saved. Unfortunately, this mode only worked with