Redesign NonEmptyLazyList to be maximally lazy
#2489
| Job | Run time |
|---|---|
| 16s | |
| 2m 8s | |
| 1m 54s | |
| 2m 7s | |
| 2m 0s | |
| 1m 52s | |
| 1m 49s | |
| 2m 7s | |
| 2m 6s | |
| 1m 50s | |
| 1m 50s | |
| 1m 59s | |
| 0s | |
| 1m 8s | |
| 3m 10s | |
| 0s | |
| 26m 16s |