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>But still...can I get around the newindex problem to be able to assign
>values to my C vars more than once?If not all else is useless.

One way is to use a proxy table that is always empty and set __index/__newindex
metamethods to read/write from your table or C. Something like this:

C={}	-- proxy for C vars

	__index = function (t,i) get and return C var i end
	__newindex = function (t,i,v) set C var i to v end

The same idea works for implementing the old gettable/settable tag methods.