siva-form.js

    changeset: computed('_model', function() {
        assert('validator must be set in siva-form', this.recordType);
        let changeset = new Changeset(this._model, lookupValidator(this.validator), this.validator);

        // ember-changeset, being the piece of shit that it is, doesn't consider something to be a 'change' if it
        // doesn't validate. We want to know if there are unsaved changes, which we can't know if we don't keep track
        // of it ourselves.

        // List of {key, value}
        this.set('changes', []);
        let oldValidateAndSet = changeset._validateAndSet;
        changeset._validateAndSet = (key, value) => {
            let change = this.changes.find(change => change.key === key);

            // If both are falsy then we can consider them equal, for every CURRENT case I can think of
            if (isEqual(value, this._model[key]) || (!value && !this._model[key])) {
                if (change) {
                    this.changes.removeObject(change);
                }
            } else if (change) {
                change.set('value', value);
            } else {
                this.changes.pushObject(new EmberObject({key, value}));
            }

            // Call ember-changeset's function, the one we have overridden
            oldValidateAndSet.bind(changeset)(key, value);
        };

        return changeset;
    }),