Wat a hell is going here?

 // Recurse if we're merging object values
if ( deep && copy && typeof copy === "object" && !copy.nodeType ) {
  var clone;

  if ( src ) {
    clone = src;
  } else if ( jQuery.isArray(copy) ) {
    clone = [];
  } else if ( jQuery.isObject(copy) ) {
    clone = {};
  } else {
    clone = copy;
  }

  // Never move original objects, clone them
  target[ name ] = jQuery.extend( deep, clone, copy );


You are going to extend with any object including a Date, a String, a
Number... (ah yes, excluding nodes).

You are going to extend (with) arrays? [1,2] and [4] to obtain [4,2].
Really?

If an object is not an array nor an object literal then extend object
with itself???

The only things to extend recursively are objects literals to me:

if ( deep && copy && jQuery.isObject(copy) && (!src || jQuery.isObject
(src)) ) {
  target[ name ] = jQuery.extend( deep, src || {}, copy );
}

Am I loosing my mind? :)

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