Collection#add tweaks #866
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* leave collection in a consistent state after throw * correct indices
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When aborting due to invalid or duplicate models the collection should be left in a consistent state. Model events,
length,_byCid, and_byIdshould not change.Also, when a comparator is supplied the indices of the models are changed after the collection is sorted. Thus we must trigger
'add'with the new values. By iterating over the collection, we avoid callingindexOffor each model.