Add basic type narrowing for $a != ''
#18764
| Job | Run time |
|---|---|
| 2m 19s | |
| 3m 28s | |
| 2m 43s | |
| 1m 54s | |
| 2m 54s | |
| 3m 14s | |
| 2m 48s | |
| 1m 58s | |
| 2m 43s | |
| 3m 14s | |
| 1m 40s | |
| 3m 4s | |
| 1m 32s | |
| 1m 40s | |
| 2m 44s | |
| 1m 33s | |
| 1m 30s | |
| 2m 58s | |
| 1m 29s | |
| 2m 56s | |
| 1m 37s | |
| 2m 59s | |
| 52m 57s |