Use BehaviorSubject for CasedObject

[replygirl]

Make a CasedObject instance and its value and options subscribable

Something like...

class CasedObject extends BehaviorSubject {
  private _options = new BehaviorSubject({})
  private _value = new BehaviorSubject({})

  // ...

  constructor(value: any, options: CasedObjectOptions) {
    this.options.next(options)

    const { case: c } = options
    this.value.next(!!case ? changeCase(c, value) : c)
  }

  // ...

  private proxied(p: string) {
    return new Proxy([this[p], {
      get: (_x, k) => this[p].value[k],
      set: (_x, k, v) => this[p].next({ ...this[p].value, [k]: v })
    }])
  }
}