The host runtime might provide the ability to spawn threads, but WASM would presumably still need to establish a memory model. I don't know if it has one, or no

The host runtime might provide the ability to spawn threads, but WASM would presumably still need to establish a memory model. I don't know if it has one, or not. (Or, I suppose it can just completely isolate the memory between threads, and say nothing is shared. But I don't think that's what people would want?)