* All-new arithmetic and number I/O conforms with R4RS.

* All-new arithmetic and number I/O conforms with R4RS.

* The variable

  (access flonum-unparser-hook (->environment '(runtime number)))

accepts two arguments (the flonum and the radix), and returns either
the string representation or #f.

* `*unparser-radix*' is recognized only when it is one of (2 8 10 16),
and it affects only exact rationals.  Inexact numbers and non-rational
complex numbers are always printed in base 10.  The radix prefix is
suppressed in base 10, or in the other bases when the number's
absolute value is less than the radix.

* Written representation of compiled entries changed to show the
"block number".

* `pp' no longer accepts hash numbers as arguments; use #@ if you want
that effect (you will need to type '#@ for scode objects).

* `trace'/`break' output changed to show arguments more clearly.