Fix @phpstan-assert not working correctly with union types
#25812
| Job | Run time |
|---|---|
| 2m 39s | |
| 1m 28s | |
| 2m 27s | |
| 2m 30s | |
| 2m 8s | |
| 3m 59s | |
| 1m 52s | |
| 3m 6s | |
| 3m 40s | |
| 4m 13s | |
| 1m 22s | |
| 1m 36s | |
| 4m 8s | |
| 2m 59s | |
| 1m 57s | |
| 2m 59s | |
| 2m 50s | |
| 1m 37s | |
| 1m 33s | |
| 1m 34s | |
| 50m 37s |