No update_hash method for GridDefinition

GridDefinition or the BaseDefinition don't have an update_hash method, even though the BaseDefinition.get_hash() tries to call it.
https://github.com/pytroll/pyresample/blob/18805996beb4b82fcdc0cc62f09b8d4caede2051/pyresample/geometry.py#L105

I've been using SatPys .resample() to regrid incoming datasets to a defined Grid but the cached weights relies on the .get_hash() method. It seems like for GridDefinitions, and maybe some others, the .update_hash() method doesn't exist. Was this intentional, still on the cards, or just missed so far?

Creating a child class with a fairly simple update_hash method makes things work smoothly.
e.g.

class GridDefinition_w_hash(geometry.GridDefinition):

    def update_hash(self, the_hash=None):
        if the_hash is None:
            the_hash = hashlib.sha1()
        the_hash.update(geometry.get_array_hashable(self.lons))
        the_hash.update(geometry.get_array_hashable(self.lats))
        try:
            if self.lons.mask is not np.bool_(False):
                the_hash.update(geometry.get_array_hashable(self.lons.mask))
        except AttributeError:
            pass
        return the_hash

Start in pyresample/geometry.py at the referenced BaseDefinition.get_hash() call and inspect existing update_hash implementations. Check GridDefinition and related definitions, then verify that hashing a GridDefinition works with the cached-weight path used by SatPy resampling.