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Sorry to need prodding!  I agree with pretty much everything
you said.  I was planning to just make the edits and submit
a new patch, but real life has got in the way.

I'll come up with a fresh patch soon.  The only thing that
wasn't clear was "Restricted mode!?"  Does this mean that
the code should behave differently in restricted mode
(probably it should fail with an explanatory exception).
Do you know off the top of your head how my C code
can find out whether it's in restricted mode?