> var data = jQuery.extend(true, {}, arrComp);
You're extending an Array into an empty Object? That would lose the
Array-ness of the original object. I don't think this is a use case
that was ever anticipated, not sure it makes sense.
You could extend into an empty array [] to fix that, but after
creating a test case and looking at the code I can see it doesn't deep-
copy that either. I don't think the top-level object was intended to
be an Array. You could open an enhancement ticket for it though.
var x = [ {test:1}, {toast:2} ];
var y = $.extend(true, [], x);
x[1] = {twist: 3};
alert( x.toSource() ); // [{test:1}, {twist:3}]
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