Redesign NonEmptyLazyList to be maximally lazy
#2490
| Job | Run time |
|---|---|
| 1m 6s | |
| 0s | |
| 15m 48s | |
| 12m 58s | |
| 27m 40s | |
| 10m 55s | |
| 12m 11s | |
| 24m 9s | |
| 8m 52s | |
| 7m 42s | |
| 11m 44s | |
| 14m 55s | |
| 30m 53s | |
| 3m 33s | |
| 13s | |
| 0s | |
| 3h 2m 39s |