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function update_post_author_caches( $posts ) {
  /*
	 * cache_users() is a pluggable function so is not available prior
	 * to the `plugins_loaded` hook firing. This is to ensure against
	 * fatal errors when the function is not available.
	 */
  if ( ! function_exists( 'cache_users' ) ) {
    return;
  }

  $author_ids = wp_list_pluck( $posts, 'post_author' );
  $author_ids = array_map( 'absint', $author_ids );
  $author_ids = array_unique( array_filter( $author_ids ) );

  cache_users( $author_ids );
}