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Mixing safe and unsafe code

As written, the SRFI appears to suggest that a Scheme 
is running either wholly in safe or unsafe mode, and 
there's no switching between modes.

One might want time-critical code running in unsafe mode, 
while the rest of the code runs in safe mode.  Perhaps 
the SRFI could suggest syntax for such mode switching, 
something like:


along with the complementary construct for switching 
from unsafe to safe mode.

-- Paul