scripted-diff: Following the C++ Standard rules for identifiers with _.

Any identifier starting with two _, or one _ followed by a capital letter is reserved for the compiler and thus must not be used. See: https://stackoverflow.com/a/228797/7130273

-BEGIN VERIFY SCRIPT-
s() { git grep -l "$1" src | xargs sed -i "s/$1/$2/g"; }

s '__pushKV' 'pushKVEnd'
s '_EraseTx' 'EraseTxNoLock'
s '_Other' 'Other'
-END VERIFY SCRIPT-

src/rpc/server.cpp

@@ -437,7 +437,7 @@ static inline JSONRPCRequest transformNamedArguments(const JSONRPCRequest& in, c
                 if (options.exists(fr->first)) {
                     throw JSONRPCError(RPC_INVALID_PARAMETER, "Parameter " + fr->first + " specified multiple times");
                 }
-                options.__pushKV(fr->first, *fr->second);
+                options.pushKVEnd(fr->first, *fr->second);
                 argsIn.erase(fr);
             }
             continue;