> The point here is that if tuples require 50 bytes, and there are 20
> bytes free on a page, pgstattuple counts 20 free bytes while FSM
> ignores the page. Recording that space in the FSM will not improve
> matters, it'll just risk pushing out FSM records for pages that do
> have useful amounts of free space.
Maybe an overloaded pgstattuple function that allows you to request FSM
behavior?
Chris