deserialize method
Restores a HashedCloner from a string produced by serialize.
Throws DeserializationFormatException if the input format is invalid.
Implementation
@override
HashedCloner deserialize(covariant String data) {
final doTypedClone = deserializeBaseFlag(data, prefix: _sName);
return HashedCloner._(HashMap<int, int>(), doTypedClone);
}