src/Bag.php
public static function fromRecursive($collection)
    {
        $arr = Arr::from($collection);

        foreach ($arr as $key => $value) {
            if ($value instanceof stdClass || \is_iterable($value)) {
                $value = static::fromRecursive($value);
            }
            $arr[$key] = $value;
        }

        return new static($arr);
    }
public static function fromRecursive($collection)
    {
        $arr = Arr::from($collection);

        foreach ($arr as $key => $value) {
            if ($value instanceof stdClass || \is_iterable($value)) {
                $value = static::fromRecursive($value);
            }
            $arr[$key] = $value;
        }

        return new static($arr);
    }
Takes the items and recursively converts them to Bags.

@param iterable|stdClass|null $collection

@return static