Huh.  I didn't see Preston volunteer to do anything here ;-)

One bit of software engineering for whoever does sign on:  nothing kills
porting a language to a new platform faster than needing to get an
obscure but core subsystem working.  So whatever is done here, to the
extent that it requires fiddling with obscure platform-specific gimmicks
for manipulating FPU state, to that extent also is it important to
retain a std C fallback (i.e., one requiring no porting effort).