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> If I write
> a,i = f(a),i+1
> then I want i to get the value i+1 regardless whether f(a) 
> feels like returning two values or not.  And the same 
> reliable 1:1 relationship should hold when I use 
> comma-separated argument lists.

Why would you write something like that knowing that f(a) could possibly
return multiple values?  If you want predictable behaviour then do
a = f(a)
i = i + 1

> Mapping a tail to a tail is still very much predictable.  But 
> a clearly expressed 1:1 relationship between explicit 
> function arguments and/or list elements should not be messed with.

I'll take you're word for it.  

I'm bowing out of this discussion now, I'm still not convinced, but I
feel like I'm fighting a losing battle.  I'll just write it off as
another wierd "lua-ism" to warn the rest of my team about. :)

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