code: function getGetterSetter(object, name, kind) {
    if (hasProperty(object, name)) {
      const descriptor = descriptorOf(object, name);
      return descriptor[kind] ?  Maybe.Just(descriptor[kind])
      :      /* otherwise */     Maybe.Nothing();
    } else {
      return Maybe.Nothing();
    }
  }
docs: --[ Helpers ]------------------------------------------------------- /*~
  Returns a getter or setter in an object.