I'm in the process of collaborating with some other folks to build a new Arduino port for GigaDevice's GD32 chips[1]. We're attempting to build on top of ArduinoCore-API. In general, It's so much better than the old way of doing things. One thing we're running into is how to handle gaps in the PinMode enum.

Specifically, we're short an OUTPUT_OPENDRAIN in PinMode

Would a PR that adds a new OUPUT_OPENDRAIN = 0x4 to the PinMode definition be welcome? If not, is there an alternate "Arduinoish" way to build the user-facing API to set a pin as an open-drain output?

[1] https://github.com/CommunityGD32Cores/ArduinoCore-GD32

Thanks!