I don't know about everyone else, but I'm finding this particular style
of email thread very difficult to follow.

Same here.

Perhaps either:
* Start a new thread for each new series version.

+1

* label the whole series with a rolling version number rather than doing it
  on a per patch basis.

+1

Would just make it easier to keep track when one reads the thread a while
after it started!

+1 :)

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