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When lat and lon is 'all', the interpolation has problems sometimes. The following example has lat = 179 if lat = 'all'. lat = list(90 , -90) has no problem.

path_obs <- '/esarchive/recon/ecmwf/era5/monthly_mean/$var$_f1h/$var$_$file_date$.nc'
data_obs <- Start(dat = path_obs,
              var = 'tas',
              file_date = '198012',
              latitude = 'all', #values(list(90,-90)), 
              latitude_reorder = Sort(),
              longitude = 'all', #values(list(0, 359.9)), 
              longitude_reorder = CircularSort(0, 360),
              time = indices(1),
              transform = CDORemapper, transform_extra_cells = 2,
              transform_params = list(grid = 'r360x181', 
                                      method = 'con'),
              transform_vars = c('latitude', 'longitude'),
              synonims = list(longitude = c('lon', 'longitude'),
                              latitude = c('lat', 'latitude')),
              return_vars = list(time = c('file_date'),
                                 latitude = NULL, longitude = NULL),
              retrieve = F)