This page is part of the web mail archives of SRFI 77 from before July 7th, 2015. The new archives for SRFI 77 contain all messages, not just those from before July 7th, 2015.
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: (with-unsafe-arithmetic ... ) along with the complementary construct for switching from unsafe to safe mode. -- Paul