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It's a low level library, it's probably just the register on the sensor itself is 16bit so that's what gets propagated up to the OS.

The most I can reach on mine is 132deg

Technically yes - might have a bit of a hard time closing it back down tho.

The underlying system API is a u16. Do you propose that this library should add logic to clamp the value between 0 and 255? What would be the point in that?

To save 1 byte in RAM for the 300MB electron app that will load this lib.