BUG: Mixed pack function?
@martin.o In !2227 (merged) are the pack functions mixed up?
` def pack2(M): return pack_hermitian(M)
def unpack(M): return unpack_hermitian(M)
def pack(M: np.ndarray) -> np.ndarray: return pack_density(M)
def unpack2(M): return unpack_density(M)`