usefullness of a piece of code in jQuery.clean

usefullness of a piece of code in jQuery.clean

Hello,

I would like to know how useful would be those code lines in jQuery.clean (line 4362) :
  1. if ( ret[i].nodeType === 1 ) {
  2.     ret.splice.apply( ret, [i + 1, 0].concat(jQuery.makeArray(ret[i].getElementsByTagName("script"))));
  3. }
And what would be the follow up if I comment those lines?

It would be very kind of you to answer me.

regards,
Florent

Edit : I use jQuery 1.4.1