[MLton-devel] Minimizing space usage in ML (fwd)

[Stephen Weeks]

> It never does any good to change a header word from immutable to
> mutable. 

Agreed.  But Matthew and I are proposing to go the other way.

> With this hack in the GC it would still make sense to go the other
> way, but nothing could be labelled immutable if it EVER gets
> mutated.

Agreed, as long as "EVER" means "EVER IN THE FUTURE".


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