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traceUnshift example

    public static function castThrowingCasterException(ThrowingCasterException $e, array $a, Stub $stub, bool $isNested)
    {
        $trace = Caster::PREFIX_VIRTUAL.'trace';
        $prefix = Caster::PREFIX_PROTECTED;
        $xPrefix = "\0Exception\0";

        if (isset($a[$xPrefix.'previous'], $a[$trace]) && $a[$xPrefix.'previous'] instanceof \Exception) {
            $b = (array) $a[$xPrefix.'previous'];
            $class = get_debug_type($a[$xPrefix.'previous']);
            self::traceUnshift($b[$xPrefix.'trace'], $class, $b[$prefix.'file'], $b[$prefix.'line']);
            $a[$trace] = new TraceStub($b[$xPrefix.'trace'], false, 0, -\count($a[$trace]->value));
        }

        unset($a[$xPrefix.'previous'], $a[$prefix.'code'], $a[$prefix.'file'], $a[$prefix.'line']);

        return $a;
    }

    /** * @return array */