Fix race-condition during multi-byte reads #1
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Bad readings can occur when multi-byte reads happen when the lsb is close to under/overflow, e.g. when the value is teetering between 255 and 256, if the change happens between the two readings, msb and lsb can be out-of-sync, so we get 0 instead of 256.
This change fixes the above, by reading both bytes in the same call.