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Builds on and extends PR ( #4595 ). Should address a CI failure seen in PR ( cloudpipe/cloudpickle#432 ).
Switches to using the internal utility class
MemoryviewHolderinstead of NumPy to allow testing without NumPy. Callsserializedirectly withpickleas the only option (instead of callingpickle_dumps). Though alsoasserts pickling did occur. Also includes some other minor fixes.Only tries manipulating writability of frames with pickle protocol 5 in use. This doesn't work for earlier pickle protocols as there is only one
bytesobject containing everything (and no way to inspect what went into it, let alone reproduce it).cc @madsbk @pierreglaser
black distributed/flake8 distributed/isort distributed