[m-dev.] Globals and concurrency

[Michael Day]

Hi Julien,

> A thought I had a while ago is that now we have mutables and the
> `attach_to_io_state' attribute we should just get rid of io.{set,get}_globals.

Last time I checked, the globals mechanism was giving us slightly better
performance than the mutables, although I have no idea why, and would not
have expected this behaviour.

Michael

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