I think there needs to be some discussion on a larger list (ie: -hackers) about this. I had been thinking along the lines of things that would break pg_upgrade, not stuff that changes user APIs. It would be difficult enough to get agreement on breaking pg_upgrade; I doubt a release that breaks practically every tool created for Postgres is going to get concensus, regardless of the version numbering.
"I'd like to break everything - who agrees?". Obviously if you approach it from that perspective, no sane person could agree.
If you are already decided one way or the other its not really worth asking.
It could only happen if the benefit outweighed the pain, so needs to be viewed in a balanced manner.
"Are there some format changes waiting to happen? If so, should we save them up into one set of changes?"
Anyway, move it to Hackers or if you don't, I will discuss at the next Dev meeting. I'm not the requestor of those changes, so if people withdraw their proposals for change, that's up to them.
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Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services