message: rpc: Use IsValidNumArgs over hardcoded size checks
diff: @@ -1033,9 +1033,7 @@ UniValue signrawtransaction(const JSONRPCRequest& request)
  static UniValue sendrawtransaction(const JSONRPCRequest& request)
  {
  - if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
  - throw std::runtime_error(
  - RPCHelpMan{"sendrawtransaction",
  + const RPCHelpMan help{"sendrawtransaction",
  "\nSubmits raw transaction (serialized, hex-encoded) to local node and network.\n"
  "\nAlso see createrawtransaction and signrawtransactionwithkey calls.\n",
  {
  @@ -1055,7 +1053,11 @@ static UniValue sendrawtransaction(const JSONRPCRequest& request)
  "\nAs a JSON-RPC call\n"
  + HelpExampleRpc("sendrawtransaction", "\"signedhex\"")
  },
  - }.ToString());
  + };
  +
  + if (request.fHelp || !help.IsValidNumArgs(request.params.size())) {
  + throw std::runtime_error(help.ToString());
  + }
  RPCTypeCheck(request.params, {
  UniValue::VSTR,
  @@ -1095,9 +1097,7 @@ static UniValue sendrawtransaction(const JSONRPCRequest& request)
  static UniValue testmempoolaccept(const JSONRPCRequest& request)
  {
  - if (request.fHelp || request.params.size() < 1 || request.params.size() > 2) {
  - throw std::runtime_error(
  - RPCHelpMan{"testmempoolaccept",
  + const RPCHelpMan help{"testmempoolaccept",
  "\nReturns result of mempool acceptance tests indicating if raw transaction (serialized, hex-encoded) would be accepted by mempool.\n"
  "\nThis checks if the transaction violates the consensus or policy rules.\n"
  "\nSee sendrawtransaction call.\n",
  @@ -1130,7 +1130,10 @@ static UniValue testmempoolaccept(const JSONRPCRequest& request)
  "\nAs a JSON-RPC call\n"
  + HelpExampleRpc("testmempoolaccept", "[\"signedhex\"]")
  },
  - }.ToString());
  + };
  +
  + if (request.fHelp || !help.IsValidNumArgs(request.params.size())) {
  + throw std::runtime_error(help.ToString());
  }
  RPCTypeCheck(request.params, {
  