make this better.

gistfile1.js

function __tailingFn () {
  for (var i = arguments.length; i--;) {
    if (typeof arguments[i] == 'function') {
      var fn = arguments[i];
      arguments[i] = undefined;
      return fn;
    }
  }
}

function __tailingFn () {
  for (var i = arguments.length; a = arguments[i]; i--) {
    if (typeof a == 'function') {
      var fn = a
      a = undefined;
      return fn;
    }
  }
}

What is the point of unsetting the fn if this is all there is to __tailingFn? arguments ceases to exist after the function is exited anyways...

function __tailingFn () {
    var a, i = arguments.length;
    while (a = arguments[i--])
        if (typeof a == 'function') {
            return a;
        }
    }
}