enh: Rename index column to __index__ and remove old version check
#3275
| Job | Run time |
|---|---|
| 6s | |
| 11s | |
| 18s | |
| 2m 4s | |
| 1m 49s | |
| 24m 12s | |
| 26m 9s | |
| 10m 52s | |
| 11m 47s | |
| 23m 29s | |
| 27m 29s | |
| 1s | |
| 2h 8m 27s |