How to use the regionmask.core.utils._equally_spaced_on_split_lon function in regionmask

def _determine_method(lon, lat):
    """ find method to be used -> prefers faster methods"""

    if equally_spaced(lon, lat):
        return "rasterize"

    if _equally_spaced_on_split_lon(lon) and equally_spaced(lat):

        split_point = _find_splitpoint(lon)
        flipped_lon = np.hstack((lon[split_point:], lon[:split_point]))

        if equally_spaced(flipped_lon):
            return "rasterize_flip"
        else:
            return "rasterize_split"

    return "shapely"