public static function get_group_moderator_ids( $group_id ) {
		global $wpdb;

		if ( empty( $group_id ) ) {
			return array();
		}

		$group_mods = wp_cache_get( $group_id, 'bp_group_mods' );

		if ( false === $group_mods ) {
			self::prime_group_admins_mods_cache( array( $group_id ) );
			$group_mods = wp_cache_get( $group_id, 'bp_group_mods' );
		}

		if ( false === $group_mods ) {
			// The wp_cache_get is still coming up empty. Return an empty array.
			$group_mods = array();
		} else {
			// Cast the user_id property as an integer.
			foreach ( (array) $group_mods as $key => $data ) {
				$group_mods[ $key ]->user_id = (int) $group_mods[ $key ]->user_id;
			}
		}

		return $group_mods;
	}