get rids of warning: \FutureWarning: xarray.DataArray.__contains__ currently checks membership in DataArray.coords, but in xarray v0.11 will change to check membership in array values.   elif d in da: (#28)
get rids of warning: \FutureWarning: xarray.DataArray.__contains__ currently checks membership in DataArray.coords, but in xarray v0.11 will change to check membership in array values.   elif d in da: (#28)


xgcm/xrft,rabernat/xrft