The real point here is that omitting the per-command subtransaction ought to be a hidden optimization, not something that intrudes to the point of having unclean semantics when we can't do it.
Sorry to be stupid here, but I didn't understand this when it was disussed originally either. Why a subtransaction per command rather than one per function? If I've got this right, this is so the PL can tidy up behind itself and report/log an appropriate error?
-- Richard Huxton Archonet Ltd
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