| ⇢ | B | inform_student() added | |
| ⇢ | B | Communication.test_broken_validator_feedback() added | |
| ⇢ | A | Communication.test_ungraded_validation_email() added | |
| ⇢ | A | Assignment.is_graded() added | |
| ⇢ | A | Validation.test_1000tfm() added | |
| B | ↗ | A | Submission.inform_student() improved | 
| A | ↘ | B | Communication.test_too_long_validation() got worse | 
| A | ↛ | Submission.inform_course_owner() removed |