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I prefer 2, since it seems closer to the meaning and therefore more intuitive. But does it really need a patch?

Yea, it seems 2 works right now ;)

On Apr 20, 2013 11:41 PM, "Dirk Laurie" <dirk.laurie@gmail.com> 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?