Protobuf\TextFormat::encodeValue PHP Method

    public function encodeValue($value)
    {
        if (is_bool($value)) {
            return (int) $value;
        }
        if ($value instanceof Enum) {
            return $value->name();
        }
        if ($value instanceof Stream) {
            return json_encode($value->__toString());
        }
        return json_encode($value);
    }