Comment #6 on issue 164 by samrreid: PNode#moveToFront change to avoid java.util.ConcurrentModificationException
http://code.google.com/p/piccolo2d/issues/detail?id=164
Immutability would be safest, but since the method is named getChildrenReference, it is possible that some client code is relying on the ability to directly manipulate the list of children. Therefore, it could be confusing to have this return a
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