GROOVY-11754: STC: prevent cast exception under imbalanced instanceof
#5030
| Job | Run time |
|---|---|
| 18m 38s | |
| 19m 35s | |
| 18m 5s | |
| 18m 38s | |
| 19m 47s | |
| 17m 49s | |
| 18m 42s | |
| 19m 51s | |
| 17m 52s | |
| 19m 26s | |
| 18m 1s | |
| 17m 59s | |
| 16m 55s | |
| 18m 47s | |
| 19m 11s | |
| 4h 39m 16s |