It Truly is hard for me to guess your intention. On 1 hand you're saying that equally a and b are community (no top underscore in their names) so I must theoretically be permitted to access/mutate (get/set) each. But Then you certainly specify an express mutator only for a, which https://smartworldeveloper.in/smart-world-69-gurgaon-redefining-urban-luxury-living-in-sector-69/