Extent-Local memory sharing?

[Gavin Ray]

Reading through the docs for the Extent-Local preview, I was trying to
understand whether
this would be usable for sharing a buffer/memory pool across virtual
threads?

Suppose you have some class:

class BufferPool {
  private List<MemorySegment> buffers;
}

The document says that the data must be immutable
But there is "interior" immutability, and "surface" immutability

If multiple virtual threads shared the memory and some potentially
perform write operations on the MemorySegment's inside of the list
would that be valid behavior?

Or does this even make sense to do?
(Concurrency/parallelism are probably the things I know the least about in
software)
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