[Checkins] [zopefoundation/persistent] d877a3: Fix PersistentDict.update to accept keyword argume...

[Jason Madden]

  Branch: refs/heads/issue126
  Home:   https://github.com/zopefoundation/persistent
  Commit: d877a30b95fc012bcedc1e8720382aafec944f7b
      https://github.com/zopefoundation/persistent/commit/d877a30b95fc012bcedc1e8720382aafec944f7b
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2020-02-15 (Sat, 15 Feb 2020)

  Changed paths:
    M CHANGES.rst
    M persistent/mapping.py
    M persistent/tests/test_list.py
    M persistent/tests/test_mapping.py
    M persistent/tests/utils.py

  Log Message:
  -----------
  Fix PersistentDict.update to accept keyword arguments.

Fixes #126.

Also optimize clear and popitem to not mark the object as changed unnecessarily.