compareTo method
Compares this object to another object.
Returns a value like a Comparator when comparing this to other.
That is, it returns a negative integer if this is ordered before other,
a positive integer if this is ordered after other,
and zero if this and other are ordered together.
The other argument must be a value that is comparable to this object.
Implementation
@override
int compareTo(EthereumAddress other) {
// TO DO (alexeyinkin): Faster comparison, maybe by words using asUint64List.
return hexNo0x.compareTo(other.hexNo0x);
}