http://jsperf.com/object-cycle-detection http://jsperf.com/object-cycle-detection I've added a jsPerf to see how bad it performs. For small objects it's reason

http://jsperf.com/object-cycle-detection http://jsperf.com/object-cycle-detection I've added a jsPerf to see how bad it performs. For small objects it's reasonable but if the object has 10 000 elements the Javascript test will take 1 second, which is not acceptable. I'd rather give people a detection cycle detection library if their input may be circular.