mootools/mootools-more — pull request #1190 by dehenne (2013-03-26 10:26:21+00:00)
Title: Fix for Drag.Move + without compatibility + droppables Array

if this.options.droppables is an array, $$() or getElements not working in MooTools Core 1.4.5 without compatibility.

not working:
$$( ['.one', '.two'] )

working:
$$( ['.one', '.two'].join(',') )