[Checkins] [zopefoundation/ZODB] 2dcd09: - ZODB now uses pickle protocol 3 for both Python ...

[GitHub]

  Branch: refs/heads/python3-compatible-persistent-refs
  Home:   https://github.com/zopefoundation/ZODB
  Commit: 2dcd0919e84cb6ec687bc2695258888e2703f2ef
      https://github.com/zopefoundation/ZODB/commit/2dcd0919e84cb6ec687bc2695258888e2703f2ef
  Author: Jim Fulton <jim at jimfulton.info>
  Date:   2018-03-25 (Sun, 25 Mar 2018)

  Changed paths:
    M CHANGES.rst
    M src/ZODB/_compat.py
    M src/ZODB/serialize.py
    M src/ZODB/tests/testSerialize.py

  Log Message:
  -----------
  - ZODB now uses pickle protocol 3 for both Python 2 and Python 3.

  (Previously, protocol 2 was used for Python 2.)

  The zodbpickle package provides a `zodbpickle.binary` string type
  that should be used in Python 2 to cause binary strings to be saved
  in a pickle binary format, so they can be loaded correctly in
  Python 3.  Pickle protocol 3 is needed for this to work correctly.

- Object identifiers in persistent references are saved as
  `zodbpickle.binary` strings in Python 2, so that they are loaded
  correctly in Python 3.