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>I'v found another useful function, IMHO worthy including in the library:
>function table.find(t, value)
>    for k,v in t do
>        if v == value then return k end
>    end

If you're going to need this often, then a much better solution is to
invert the table:

function table.invert(t)
	local s={}
	for k,v in t do s[v]=k end
	return s

Then, instead of table.find(t,v), use s[v], where s=table.invert(t).