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Add Backend as superclass of SerialHardwareBackend #595
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Spotted by @sersorrel in srobo/sr-robot3#2 (comment)
This also means that the abstract methods are now actually enforced.
We should consider introducing a run-time type check for this, but I am
unable to think of a good place to put it at the moment.
Checklist
semver-major
,semver-minor
orsemver-patch
label as appropriateWhy do you want to make these changes?
Stops need to cast to
Type[Backend]
in environment definitions.Which parts of the codebase do your changes affect?
SerialHardwareBackend
and subclasses thereof,SRV4MotorBoardBackend
,SBArduinoHardwareBackend
How do your changes affect student or volunteer experience?
Shouldn't make any difference. This is purely for typing
Are your changes related to any existing issues or PRs? How so?
We had previously attributed this bug to #489, although didn't have an open issue for it :/