it will be save about 1k if replace this with a local variable.

e.g.

get: function( num ) {
		return num != null ?

			// Return a 'clean' array
			( num < 0 ? this[ num + this.length ] : this[ num ] ) :

			// Return just the object
			slice.call( this );
	}

replace it with

get: function( num ) {
   var that = this;
		return num != null ?

			// Return a 'clean' array
			( num < 0 ? that[ num + that.length ] : that[ num ] ) :

			// Return just the object
			slice.call( that );
	}