Move moves exactly n from src to dst.

MoveUpTo moves up to n from src to dst, and returns the amount moved.

NewFromUint64 creates a new Quantity from an uint64 or panics.

NewQuantity creates a new Quantity, initialized to zero.

ErrInsufficientBalance is the error returned when an operation fails due to insufficient balance.

ErrInvalidAccount is the error returned when an operation fails due to a missing account.

ErrInvalidQuantity is the error returned on malformed arguments.

Quantity is a arbitrary precision unsigned integer that never underflows.