MarketDataResponse &putText(std::string_view str)
    {
        const size_t srcLength = str.length();
        if (srcLength > 64)
        {
             throw std::runtime_error("string too large for putText [E106]");
        }
        size_t length = srcLength < 64 ? srcLength : 64;
        std::memcpy(m_buffer + m_offset + 54, str.data(), length);
        for (size_t start = srcLength; start < length; ++start)
        {
            m_buffer[m_offset + 54 + start] = 0;
        }
        return *this;
    }