+@ Catch -(2^63) as a special case since its absolute value will overflow
+@ a twos-complement 64-bit word.
+SNS | DUP
+SSTTSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSN | -(2^63)
+TSST | SUBTRACT
+NTSSTSSSSTTSSSSSSTSN | BRZ > 01000011 00000010
+
+@ No special case applies. Prepare for computation by converting the number
+@ to absolute value and preparing a string on the stack.
+NSTTSSSTN | JSR > 10001 (absolute value)