NewInt constructs Int from int64.

NewIntFromBigInt constructs Int from big.Int.

NewIntFromUint64 constructs an Int from a uint64.

ZeroInt returns Int value with zero.

SerializableInt is basically copied from cosmos-sdk/types/Int but: - doesn’t have a bit-length restriction - uses GobEncode/GobDecode instead of serializing to an ascii string - removes superfluous functions to do `big.Int` math on the underlying value.