RPC bumpfee with an explicit feerate using `conf_target` and `estimate_mode` errors with `JSONRPCException: JSON integer out of range (-1)`.
{
    bool want_psbt = method_name == "psbtbumpfee";
    return RPCHelpMan{method_name,
        "\nBumps the fee of an opt-in-RBF transaction T, replacing it with a new transaction B.\n"
        + std::string(want_psbt ? "Returns a PSBT instead of creating and signing a new transaction.\n" : "") +
        "An opt-in RBF transaction with the given txid must be in the wallet.\n"
        "The command will pay the additional fee by reducing change outputs or adding inputs when necessary. It may add a new change output if one does not already exist.\n"
        "All inputs in the original transaction will be included in the replacement transaction.\n"
        "The command will fail if the wallet or mempool contains a transaction that spends one of T's outputs.\n"
        "By default, the new fee will be calculated automatically using estimatesmartfee.\n"
        "The user can specify a confirmation target for estimatesmartfee.\n"
        "Alternatively, the user can specify a fee_rate (" + CURRENCY_UNIT + " per kB) for the new transaction.\n"
        "At a minimum, the new fee rate must be high enough to pay an additional new relay fee (incrementalfee\n"
        "returned by getnetworkinfo) to enter the node's mempool.\n",
        {
            {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The txid to be bumped"},
            {"options", RPCArg::Type::OBJ, RPCArg::Optional::OMITTED_NAMED_ARG, "",
                {