How do I set `user_properties` on identify calls with ampli?

How do I set `user_properties` on identify calls with ampli?

This page here say that the ampli will generate an identify method with an overload that looks like:

ampli.identify('user_id', {/* user props */}, {/* amplitude options */ })

but that isn’t what I see with `@amplitude/ampli/1.31.0 darwin-arm64 node-v18.14.1` /      `@amplitude/analytics-browser@1.9.1`

  /**
   * Identify a user and set user properties.
   *
   * @param userId The user's id.
   * @param options Optional event options.
   */
  identify(
    userId: string | undefined,
    options?: EventOptions,
  ): PromiseResult<Result> {
    if (!this.isInitializedAndEnabled()) {
      return getVoidPromiseResult();
    }

    if (userId) {
      options = {...options,  user_id: userId};
    }

    const amplitudeIdentify = new amplitude.Identify();
    return this.amplitude!.identify(
      amplitudeIdentify,
      options,
    );
  }

type `EventOptions` looks promising, especially the `.extra` field -- but when passing values into that field, do not see them in the user_properties event of the outgoing identify requests.

I can and will drop down to the untyped SDK, but how am I supposed to do this with the ampli wrapper?