- random-fixnum Nprocedure
Return a fixnum in the range 0 .. N-1, where N is an exact integer.
On a 32-bit system, the range is 0 .. 2^30-2.
On a 64-bit system, the range is 0 .. 2^62-2. There are at most 53 bits of precision, so when N >= 2^53 there will be gaps in the range.