Bugs discovered in intcode:
- Relative base was reset on await input suspend.
- No handling for incorrect intcodes.
- State was sometimes corrupted when resumed after
suspend.
Fixed and Patched in 0.3.2
Refactored the intcode computer to live in a separate
file, since it will come back more times.
As a nice touch, output of aoc.py will print the version
used of the intcode.
As another nice touch, the int code has a CHANGELOG.
