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>I know there is a restriction when it come to string index (i.e. they 
>start at 1) but there is no such restriction on tables, so why does 
>tinsert not start at index 0?

For consistency with table expressions: t={10,20,30} sets t[1] to 10, not
t[0] to 10.

If you really want to start with zero, try

	tinsert( t, "A" )
	tinsert( t, "B" )
	tinsert( t, "C" )

But remember that your loops should now start at 0 too:

	for i=0 to getn(t) do ... end