[3.15] gh-149083: Convert _initial_missing for pure py reduce to sentinel (GH-149536)
#115539
| Job | Run time |
|---|---|
| 35s | |
| 35s |
_initial_missing for pure py reduce to sentinel (GH-149536)
#115539
| Job | Run time |
|---|---|
| 35s | |
| 35s |