core: Somfy API integration bug: TypeError: unsupported operand type(s) for -: 'int' and 'str'

Home Assistant release with the issue: 0.103.2

Last working Home Assistant release (if known): 0.102.x (9 dec)

Maybe since this commit was in the release: https://github.com/home-assistant/home-assistant/pull/29675 or maybe Somfy changed something on their end but can’t find any release notes.

Operating environment (Hass.io/Docker/Windows/etc.): Docker

Integration: https://www.home-assistant.io/integrations/somfy/

Description of problem:

Shutter component not working anymore (roller_shutter_positionable_stateful_generic)
Screen does work (exterior_blind_positionable_stateful_generic)

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant):

somfy:
  client_id: xxx
  client_secret: xxx

Traceback (if applicable):

2019-12-19 12:45:38 ERROR (MainThread) [homeassistant.core] Error doing job: Task exception was never retrieved
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 286, in async_update_ha_state
    self._async_write_ha_state()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 327, in _async_write_ha_state
    attr.update(self.state_attributes or {})
  File "/usr/src/homeassistant/homeassistant/components/cover/__init__.py", line 198, in state_attributes
    current = self.current_cover_position
  File "/usr/src/homeassistant/homeassistant/components/somfy/cover.py", line 69, in current_cover_position
    position = 100 - self.cover.get_position()
TypeError: unsupported operand type(s) for -: 'int' and 'str'

Additional information: