aggregator issue for readings, close on overfill

[epogrebnyak]

Checked means refered elsewhere in the issues:

• [ ] https://www.haskell.org/tutorial/classes.html - haskell docs own tutorial
• [x] CS 240h - level up to intermediate haskell, some beginner-to-prod issues
• [x] enum type in haskell (maybe good for dice example)