RPC bumpfee with an explicit feerate using `conf_target` and `estimate_mode` errors with `JSONRPCException: JSON integer out of range (-1)`.
RPCExamples{
                    HelpExampleCli("listsinceblock", "")
            + HelpExampleCli("listsinceblock", "\"000000000000000bacf66f7497b7dc45ef753ee9a7d38571037cdb1a57f663ad\" 6")
            + HelpExampleRpc("listsinceblock", "\"000000000000000bacf66f7497b7dc45ef753ee9a7d38571037cdb1a57f663ad\", 6")
                },
        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
{
    std::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(request);
    if (!pwallet) return NullUniValue;
    const CWallet& wallet = *pwallet;
    
    
    wallet.BlockUntilSyncedToCurrentChain();
    LOCK(wallet.cs_wallet);
    
    Optional<int> height = MakeOptional(false, int()); 
    Optional<int> altheight; 
    int target_confirms = 1;
    isminefilter filter = ISMINE_SPENDABLE;
    uint256 blockId;
    if (!request.params[0].isNull() && !request.params[0].get_str().empty()) {
        blockId = ParseHashV(request.params[0], "blockhash");
        height = int{};
        altheight = int{};
        if (!wallet.chain().findCommonAncestor(blockId, wallet.GetLastBlockHash(),  FoundBlock().height(*height),  FoundBlock().height(*altheight))) {
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
        }
    }
    if (!request.params[1].isNull()) {
        target_confirms = request.params[1].get_int();