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Why can't you just use a wrapper function? Trivial to do, and doesn't need any patching:

function g(x, y)
	f(x, y or 0)

And of course, it's easy to wrap transparently:

	local fo = f
	function f(x, y)
		fo(x, y or 0)


On Apr 20, 2013, at 11:41 PM, Dirk Laurie <> wrote:

>    function f(x,y=0)
>    function f(x,y or 0)
> to mean
>    function f(x,y) y=y or 0
> Neither would break existing code.
> Which of the above should I choose to implement as a patch?