gistfile1.txt

class Database extends Jig {
   get(key) { return this[key] }
   set(key, value) { this[key] = value }
}

class MemDatabase {
  constructor() { this.database = new Database(); this.kv = {} }
  load() { this.kv = this.database.get('db') }
  save() { this.database.set('db', this.kv) }
  get(key) { return this.kv[key] }
  set(key, value) { this.kv[key] = value }
}