public function bucket_list($include_default_bucket = true)
	{
		$bucket_list = array();

		foreach ($this->buckets as $bucket_id)
		{
			// skip the default bucket if ignored
			if ( ($include_default_bucket === false) && ($bucket_id === self::DEFAULT_BUCKET) )
			{
				continue;
			}

			$bucket_list[] = $bucket_id;
		}

		return $bucket_list;
	}