Constructor overrites initial state?

[kzap]

the constructor examples overwrites initial state by default so what if your initial state comes from outside? how do you insert that after the CONSTRUCTOR or do we make the CONSTRUCTOR method decide how to merge passed data?

CONSTRUCT (domain) {
            return domain.concat(
              Immutable.fromJS([
                {
                    id: _.uniqueId(),
                    name: 'foo',
                    done: true
                },
                {
                    id: _.uniqueId(),
                    name: 'bar',
                    done: false
                },
                {
                    id: _.uniqueId(),
                    name: 'baz',
                    done: false
                },
                {
                    id: _.uniqueId(),
                    name: 'quux',
                    done: false
                }
            ])
          );
        },