documentcloud/underscore — comment on commit e79586515c5f635650afc32976826e01463dcd1d
File: test/objects.js line 186
By kitcambridge:

Sure...

var propertyIsEnumerable = Object.prototype.propertyIsEnumerable;
if (propertyIsEnumerable.call(a, "length") && propertyIsEnumerable.call(b, "length")) {
if (a.length != b.length) return false;
}