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I am about to add some native-facing stuff, so make sure outdated JNR
libraries don't introduce bugs.

Existing code based on Int-based frame selectors should not break with
the help of RichMuCtx.

Consider the master branch of the microvm-spec as using the
goto-with-value form.

Useful for initialising reference fields to pre-allocated objects whose
references are held in global cells.

No C code written.