Method has

docs/app/js/sanddance-app.js:110712–110714

(value)

        if (values != null) for (const value of values)this.add(value);
    }
    has(value) {
        return super.has(intern_get(this, value));
    }
    add(value) {
        return super.add(intern_set(this, value));
    }