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> BTW, I think I figured out why there's resistance to adding
> the "fori" syntax.  Base Lua has no concept of lists/vectors
> at all; everything that treats tables this way is in liblualib.a,
> not liblua.a.

This is not entirely true.  The VM deals with lists for the vararg stuff.
It doesn't know how to compute n for an arbitrary table however.

> If there was a way to set a tag method for iteration, I would be
> happy with that, or perhaps a for syntax that allowed a
> user-specified iterator function in some non-ugly way.
>  (for i,v in t in numeric_order, where numeric_order is a global
> function that gives me 1,2,3,4..getn behavior.)

See for some ideas.