[jQuery] how to add elements to a jQuery object without copying it
i seem to remember i asked this question before, but am unable to
retrieve that post---given a jQuery object with a collection of DOM
nodes, how can i append another DOM node (like `[].push()` would do)
to that collection without breaking object identity? i need
var t = $( '.foo' );
var s = t;
t.push( '.bar' ); // should now like like $( '.foo,.bar' )
assert( s === t, 'object identity broken' )
any ideas what to write for `$().push`?
cheers & ~flow