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6b7a3c8851
Add a nice __repr__ to the GPIODevice base class. This isn't much but generally I think `__repr__` implementations should be deliberately simple: firstly, they're frequently used for debugging so if they're at all complex you risk making a debugging tool buggy (very annoying!). Secondly, if you pour too much info into them you risk making the debugging output cluttered, so I tend to prefer keeping it to straight-forward simple to retrieve/calculate info without excessive detail (if the user wants more, they can always query it directly). There is one refinement here: in SmoothedInputDevice, `__repr__` is tweaked to ensure that when partial is False (the default), and the queue isn't filled, `__repr__` doesn't block (because it should *never* block).