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t = db.jstests_js1; t.remove({}); t.save({z: 1}); t.save({z: 2}); assert(2 == t.find().length()); assert(2 == t.find({ $where: function() { return 1; } }).length()); assert(1 == t.find({ $where: function() { return obj.z == 2; } }).length()); assert(t.validate().valid);