RPC bumpfee with an explicit feerate using `conf_target` and `estimate_mode` errors with `JSONRPCException: JSON integer out of range (-1)`.
{
    std::string result;
    for (const auto& r : m_results) {
        if (r.m_cond.empty()) {
            result += "\nResult:\n";
        } else {
            result += "\nResult (" + r.m_cond + "):\n";
        }
        Sections sections;
        r.ToSections(sections);
        result += sections.ToString();
    }
    return result;
}
std::string RPCExamples::ToDescriptionString() const