final public static function check_idict(
		array $array, array $keys, bool $trim=false
	) {
		if (false === $array = self::check_dict($array, $keys, $trim))
			return false;
		foreach ($array as $val) {
			if (!is_numeric($val) && !is_string($val))
				return false;
		}
		return $array;
	}