That would help, but in the chunk of the thread I read, most of the debate was about what to do after that: specifically (a) avoiding the cost of starting up a

That would help, but in the chunk of the thread I read, most of the debate was about what to do after that: specifically (a) avoiding the cost of starting up a new interpreter, especially module import work, and (b) possibly taking advantage of the shared address space to be able to share some immutable objects somehow, rather than copying.