176     atCol.add(e, {at: 1});  property
196     var collection = new Backbone.Collection([{at: 0}, {at: 1}, {at: 9}]);  property
197     collection.add([{at: 2}, {at: 3}, {at: 4}, {at: 5}, {at: 6}, {at: 7}, {at: 8}], {at: 2});  property
212     collection.add(new Backbone.Model({id: 1}), {at: 1});  property
220     collection.add(new Backbone.Model({id: 1}), {at: 5});  property
1090     collection.add({}, {at: 0});  property
1767     collection.add([{val: 1}, {val: 2}, {val: 3}], {at: 1});  property
1768     collection.add({val: 5}, {at: 10});  property
1773     var collection = new Backbone.Collection([{at: 0}]);  property
1777     collection.add([{at: 1}, {at: 2}]);  property
1819     collection.add([{id: 2}, {id: 3}], {at: -1});  property
1820     collection.add([{id: 2.5}], {at: -2});  property
1821     collection.add([{id: 0.5}], {at: -6});  property
1828     collection.add([{id: 3}], {at: '1'});  property