def arrays_to_hdf5(filename="cache.hdf5"):
    """Returns registry for serialising arrays to a HDF5 reference."""
    return Registry(
        types={
            numpy.ndarray: SerNumpyArrayToHDF5(filename, "cache.lock")
        },
        hooks={
            '<ufunc>': SerUFunc()
        },
        hook_fn=_numpy_hook
    )
Returns registry for serialising arrays to a HDF5 reference.