Discussion about how to add a new PRIMITIVE_TYPES to rosidl(msg)

[dirk-thomas]

@johnmark

I still think that using bytes rather than list[byte] would be a good move (at least from IDL byte[] types, if not for uint8[] types).

Just mention the current state: you can already use byte[] in a .msg file and the resulting field in Python will be of type bytes (see rosidl_python/rosidl_generator_py/rosidl_generator_py/generate_py_impl.py at 3b97dc828ad14e3360ac52a1ef90ff335ce65715 · ros2/rosidl_python · GitHub).