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> Each thread has its own Janet heap, which means threads behave more like processes that communicate by message passing.

Janet doesn’t seem to have shared-memory multithreading. Each thread runs independently, so a GIL should not be necessary.

Though you can share memory manually, i.e. in C but access it from Janet.

I wrote similar here: https://github.com/ahungry/janet-pobox although it probably needs updates to work with 1.18 and above.

Oh, that's really cool. :) Thanks for mentioning it.