[R6RS] proposing ten procedures

[William D Clinger]

Mike wrote:
> How realistic is doing `flonum->rational' and `number->string'
> efficiently without assuming IEEE 754?

It is unrealistic for the reference implementation
to implement those procedures without assuming IEEE
arithmetic, but it is entirely realistic for some
other implementation to implement those procedures
for non-IEEE representations.

The ten procedures I proposed were intended to go
into the R6RS.  They weren't just help procedures
for the reference implementation; had they been, I
wouldn't have bothered the editors about them.

Will