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> >  and don't mention optimisation of commutative operations in the
> > language definition, but only do it in cases where it makes no
> > difference.
> That means never :(  Lua has dynamic typing, so the compiler cannot tell
> whether changing order will make any difference...

Ah, I see. You can tell that one operand is a constant, but you can't tell 
what the other is, and a method might want to use a numeric operand on one 
side, but not on the other...

In that case, I suppose you do need explicit rules.

-- | art, n.  romanticized mundanity