Destructor with clearInterval() is needed?

[ishiguroJSK]

Hello.
In our application we repeat creating the mjpegcanvas instance and discarding it.
I expect the instance can be discarded by mjpeg_canvas = null; ,
but the instance doesn't seem to be released by Garbage Collector,
and 6 or 7 repeats cause rendering stop.
tork-a/visualization_rwt#92

I doubt that the setInterval() is disturbing GC (https://reliablejavascript.com/2017/11/05/how-timer-intervals-can-leak-memory/),
and I solved this problem by adding clearInterval().

How about adding destructor function with clearInterval()?