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I think these are all good now.
Have a review, but maybe wait to pull until I have added an example (will be servo control via PCA9685, illustrates many but not all of the i2c functions)?
Note the comments on returns with data:
general note about returns with data.
if using await fn(), you will get an array back [count, d0, d1, d2 ...]
if using fn(callback), you will get (err, count, d0, d1, d2 ...)