review_by_user: dict[str, PullRequestReview] = {}
    for review in reviews:
        if review.user.login in review_by_user:
            stored_review = review_by_user[review.user.login]
            if review.submitted_at >= stored_review.submitted_at:
                review_by_user[review.user.login] = review
        else:
            review_by_user[review.user.login] = review
    approved_reviews = [