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What's the worse case latency of said garbage collection and how many embedded use cases does that preclude?

Well, the worst case of not having garbage collection is crashing due to memory leaks.

So tell me... is predictable latency worse than a hard crash?

Hard real time stuff generally doesn't leak because they statically allocate the at rest data and stack allocate the intermediate data.

Hard real time stuff also is, by definition, broken code if you can't reason about worse case latency.

Then why Java programms still have memory leaks?

The most significant form of garbage collection in the ECMAScript community is called npm.

Funny joke, but I have doubts about garbage collector in the world of Embedded Software.

Embedded spans a lot of different usecases and requirements. For lots of things a garbage collector is a non-issue. Not everything has hard realtime requirements.

Flawed one, it failed to collect itself.