[Microbit-Python] How does GC work in micro:bit MicroPython?

[Larry Hastings]

I don't see any registration for gc finalizers.  No __del__ anywhere.  
So how do objects get cleaned up?

For example, the constructor for microbit.Image creates a "new 
MicroBitImage()" object.  Where is this object deleted?

Does it just walk the /entire/ heap, use a heuristic to find things that 
"look" like pointers, and recycle anything that it believes isn't reachable?


//arry/
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