Are you sure about the syntax of that last paragraph? Didn't you mean to write

foo = foo.wrap(function (original) {
  // do some enhanced functionality...
  original();  // now call the original
})

So that it takes any function and wraps it. Basically its a way to override an existing function. Useful in cases such as:

function foo(){
  // does something
}

// later on we want to enhance foos behavior... normally we would have to do this:

var _foo = foo
foo = function(){
  // do some enhanced functionality...
  _foo(); // now call the original
}

// but with wrap we could instead do this:

foo = foo.wrap(original){
  // do some enhanced functionality...
  original();  // now call the original
}

The pascal casing is determined by the capitalization of the first word, not underscore vs dashes. I'll update the description to be more clear.