isset() narrows string-key in int-keyed-array to numeric-string
#4696
| Job | Run time |
|---|---|
| 1m 47s | |
| 1m 50s | |
| 1m 52s | |
| 1m 47s | |
| 1m 32s | |
| 1m 30s | |
| 1m 24s | |
| 1m 40s | |
| 13m 22s |