"Enabling" C threads in a Python / Wasm environment

Scarred by bare metal programming during my formative years, I consider the speedup from multithreading worth pursuing no matter how limited a form of it you’ll get, and no matter how hideous the hacks you’ll need to make it work. In today’s quest, we shall discover the various ways in which threads don’t work in a Python, Wasm, and especially a Python on Wasm environment, and then do something…