What are people using for the revision values on their events? Originally we started off with simple integers that we incremented every time we made a change to an event that required upcasting, e.g., @Revision("3"). But now I'm thinking of switching to a date-based setup like @Revision("20170713.0") so that upcasters can, say, do
if (serializedType.getRevision().compareTo("20170713") < 0 && [other filter criteria])
rather than needing to potentially keep track of which event classes are on which revision number at the time we make a particular change that spans multiple event types.
What other conventions have people found most useful?