Classes wrapping integer values should check range

typedef nanotime

{ description "Absolute number of nanoseconds since the start of the UNIX epoch."; type uint64; units nanoseconds; }

results in Nanotime class wrapping a BigInteger. The constructor of the class does not check for range, allowing a Nanotime to be constructed which does not fit an uint64.

This applies to any range upgrades (such as uint8 being served by short), as well as when the range is restricted explicitly by a range YANG statement.