More function arguments options

[vinz243]

It would be really cool if for example, in addition to this:

func = (foo, bar="bar") ->

We could do for example:

func = (foo [,String bar="bar"], function callback) ->

And it would be translated into:

func = function(foo, bar, callback) {
   if(typeof bar === "function") {
     callback = bar;  
     bar = "bar"
   }
}

And many more other options

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