When is an infinite loop not an infinite loop?

When it's body takes enough time that the transaction times out before the stack overflows.

This of course was aggrivated by the fact that everytime I identified precisely when the transaction was marked for rollback, it was iterating over a Tuples. This isn't surprising given we spend alot of our time iterating over Tuples. Not that that occurred to me until after I found the bug. Hence I spent all of yesterday looking inside the TuplesOperations and half a dozen Tuples subclasses.

Yesterday was definately the most fustrating days I've had in some time.