Instead of having individual files for each page
revision (especially small ones), it would be fabulous
to simply use RCS (or a similar versioning system) that
stores version deltas in a single file for each topic.
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Given the available resources on the team, I don't see
anyone getting to this in the near future. However, the
design explicitly allows for other implementations - this is
something that could be added on by anyone with the time to
write the code.
It's a good idea, though. I'll leave the feature request
open, but I'm going to lower the priority.