It would be great to adapt `xr_add_cyclic_longitudes` for curvilinear grids. Cartopy now has [`add_cyclic`](https://scitools.org.uk/cartopy/docs/latest/reference/generated/cartopy.util.add_cyclic.html) which might help with this, but [may or may not operate on xarrays](https://github.com/SciTools/cartopy/issues/2342).
It would be great to adapt
xr_add_cyclic_longitudesfor curvilinear grids. Cartopy now hasadd_cyclicwhich might help with this, but may or may not operate on xarrays.