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TIPS FOR ADDING THREADS SUPPORT TO A NEW PLATFORM:

A useful sequence of investigative steps is:
- Learn how to create a worker thread on the platform.
   - And how to wait for the worker to signal an 'init-done' event.
   - And how to send/receive messages in a worker thread.
   - And how to send/receive messages in the parent thread.
- Learn how to spin up a new JS engine (empty context)
   - And how to set the body of code running there.
   - And how to insert named objects into that code's globals.
- Learn how to make the main JS thread run code synchronously, relative
  to its other JS execution (i.e. wait until code returns to top level).
   - And how to pump/handle messages in worker threads.
   - Note: thread creator must wait synchronously for JS init code to run.
- Learn how to set/save a JS function token.
   - And how to invoke that JS function token.
   - Note: parent and workers may require different implementations.