Quick notes... The threads feature is in proposed status vs others that are in implementation status [0], but I assume this has been implemented before things like multi-value. I wonder why threads first, I assume just for experimentation. It should be noted that threads are essentially atomic memory accesses and wait/notify, nothing for starting a worker inside of WASM or anything, that is still in JS land. The test cases don't appear to include wait/wake nor does the test case interpreter that I saw [1]. Also, "Report issues" in the blog post links to https://TBD.

0 - https://github.com/WebAssembly/proposals 1 - https://github.com/WebAssembly/threads