i'm not an expert, but: once value of thunk is evaluated, it's
written
back by code called mutator
Whilst that is indeed mutation, it is not what is usually referred to
as the "mutator" in the context of garbage collection. Quite simply,
the "mutator" is the actual running program, as opposed to the GC,
which is part of the underlying runtime system. Conceptually, the
mutator and GC are the two mutually-exclusive threads of control that
modify the heap. Usually one must halt while the other runs.
Regards,
Malcolm
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