244     collection.add({id: 1, name: 'Moses'}, {merge: true});  property
246     collection.add({id: 1, name: 'Tim'}, {merge: true, silent: true});  property
303     collection.add({model: {id: 1, name: 'Alf'}}, {parse: true, merge: true});  property
1062     collection.add({id: 1, x: 3}, {merge: true});  property
1215     collection.set([m1, {id: 2, a: 1}], {merge: false});  property
1349     collection.set([{id: 1}, {id: 2}, {id: 3}], {merge: false});  property
1449     collection.add({id: 1, a: 1}, {merge: true}); // do sort, comparator change  property
1450     collection.add({id: 1, b: 1}, {merge: true}); // don't sort, no comparator change  property
1451     collection.add({id: 1, a: 1}, {merge: true}); // don't sort, no comparator change  property
1453     collection.add(collection.models, {merge: true}); // don't sort  property
1465     collection.add({id: 1, a: 1}, {merge: true}); // do sort, model change  property
1466     collection.add({id: 1, b: 1}, {merge: true}); // do sort, model change  property
1467     collection.add({id: 1, a: 1}, {merge: true}); // don't sort, no model change  property
1469     collection.add(collection.models, {merge: true}); // don't sort  property