Let me see if I'm understanding this correctly.
The previous setup we had, that was largely considered a disaster, also
had JSContexts on different threads. The big difference here is that the
zone groups do not need to share data for the most part. So we don't
need the fine-grained locking like we used to have. We can keep the vast
majority of shared data on the JSRuntime, so it is clear what can be
shared. And call stacks should never have more than one zone group, plus
the system zone group. Is that all correct?
Where is this not true? As in, where are the expected hard parts?
How does the system zone group work? What happens in cases where you do
want to do things across zone groups, eg memory accounting?
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