> I don't know -- what is the point of pure space?
That you don't have to GC it ...
The original point was to share memory between Emacs jobs.
I am not sure that is still very important, but it might be.
Also in some older systems without copy-on-write, marking the corresponding
section as read-only allowed it to be shared between instances of the
Emacs process, but nowadays I can't think of any situation where that would
be relevant.
Segregating the data that will never be altered would increase sharing
even on systems that have copy-on-write.
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