This fixes:

  Traceback (most recent call last):
    File "neo/client/Storage.py", line 108, in tpc_vote
      return self.app.tpc_vote(transaction)
    File "neo/client/app.py", line 546, in tpc_vote
      self.waitStoreResponses(txn_context)
    File "neo/client/app.py", line 539, in waitStoreResponses
      _waitAnyTransactionMessage(txn_context)
    File "neo/client/app.py", line 160, in _waitAnyTransactionMessage
      self._handleConflicts(txn_context)
    File "neo/client/app.py", line 514, in _handleConflicts
      self._store(txn_context, oid, serial, data)
    File "neo/client/app.py", line 452, in _store
      self._waitAnyTransactionMessage(txn_context, False)
    File "neo/client/app.py", line 155, in _waitAnyTransactionMessage
      self._waitAnyMessage(queue, block=block)
    File "neo/client/app.py", line 142, in _waitAnyMessage
      _handlePacket(conn, packet, kw)
    File "neo/lib/threaded_app.py", line 133, in _handlePacket
      handler.dispatch(conn, packet, kw)
    File "neo/lib/handler.py", line 72, in dispatch
      method(conn, *args, **kw)
    File "neo/client/handlers/storage.py", line 143, in answerRebaseObject
      assert cached == data
  AssertionError