Protobuf\StreamCollection::offsetSet PHP Method

    public function offsetSet($offset, $value)
    {
        if (!$value instanceof Stream) {
            throw new InvalidArgumentException(sprintf('Argument 2 passed to %s must be a \\Protobuf\\Stream, %s given', __METHOD__, is_object($value) ? get_class($value) : gettype($value)));
        }
        parent::offsetSet($offset, $value);
    }