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polyval with timedelta64 coordinates produces wrong results What happened?

polyval with timedelta64 coordinates produces wrong results What happened?: a task in Lego-RL-SWE-Bench-Verified (Harbor dataset). I'm not sure if this is a bug or an expected breaking change, but I'm not able to reproduce the results generated by polyval using a timedelta64 coordinate. The…

The task

I'm not sure if this is a bug or an expected breaking change, but I'm not able to reproduce the results generated by `polyval` using a timedelta64 coordinate. The results are correct in `xarray=2022.3.0`, whereas they are wrong in the latest unreleased version (`main`, `commit 6bb2b855498b5c68d7cca8cceb710365d58e604`).

Part of Lego-X/Lego-RL-SWE-Bench-Verified.