setting BI operands

[Ben Elliston]

   : If the appropriate setter method for BI operands were altered to include
   : something like (newval > 0) rather than (newval), we could ensure that these
   : operands only ever equal zero or one.

   This would be a restriction over the C rules (0 vs !0).  In what
   context is it an improvement?

A port I've worked on had frequently did this:

   (set cbit (if QI newc 1 0))

It should be possible to just use:

   (set cbit newc)

and for newc to be coerced to BI, based on the convention you've mentioned.

Ben