Are the keycodes limited to str(ints) as a requirement?

[marcidy]

Note to self:

    if ev.code == evdev.ecodes.KEY_ENTER:
      yield "".join(map(str, keys))
      keys = []
    else:
      log(f"Appending keycode: {c.keycode}, {c.keycode[4:]}")
      try:
        keys.append(int(c.keycode[4:]))
      except ValueError:
        pass

this implies that only keys which can be converted to an int are stored, e.g. KEY_[0-9]. Is that a requirement?