When I have a Lua function with 2 arguments:
        function f(a,b)

called through:

and do this actually with one argument:

then I find that the absent argument b in f(a,b) is not nil but a string of length 1.

That is a bit of a nuisance because I would like to use the Lua idiom:
        function f(a,b)
        local b = b or default
but that is frustrated by the behaviour shown.

Is this an artifact of either luatex or ConTeXt? Can it be avoided such that in this case b will be nil?

Hans van der Meer

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