[Checkins] [zopefoundation/ZODB] 4d0512: Various fixes suggested in review

[GitHub]

  Branch: refs/heads/handle_serial
  Home:   https://github.com/zopefoundation/ZODB
  Commit: 4d0512f117dad1533fc40ccb746e2edcac312930
      https://github.com/zopefoundation/ZODB/commit/4d0512f117dad1533fc40ccb746e2edcac312930
  Author: Julien Muchembled <jm at nexedi.com>
  Date:   2016-07-06 (Wed, 06 Jul 2016)

  Changed paths:
    M src/ZODB/DemoStorage.py
    M src/ZODB/FileStorage/FileStorage.py
    M src/ZODB/MappingStorage.py
    M src/ZODB/tests/blob_transaction.txt

  Log Message:
  -----------
  Various fixes suggested in review