fix: bugs after copilot review

Author: Mikhus

src/UDPClusterManager.ts

@@ -370,7 +370,6 @@ export class UDPClusterManager extends ClusterManager {
                     socket.close(() => {
                         // unref may be missing or not a function on mocked sockets
                         if (socket && typeof (socket as any).unref === 'function') {
-                        if (socket && hasUnref(socket)) {
                             socket.unref();
                         }
 

test/profile.more.branches.spec.ts

@@ -40,13 +40,7 @@ describe('profile.ts additional branches', () => {
         const fakeLogger: any = {
             error: sinon.spy(),
         };
-    it('logDebugInfo: should call logger.error on JSON.stringify error (explicit stub)', () => {
-        const { logDebugInfo, LogLevel } = mock.reRequire('../src/profile');
-        const fakeLogger: any = {
-            error: sinon.spy(),
-        };
-        const args = [{ foo: 'bar' }];
-        const jsonStringifyStub = sinon.stub(JSON, 'stringify').throws(new Error('Serialization failed'));
+        const args = [BigInt(1)]; // JSON.stringify throws on BigInt
         const options = {
             debugTime: false,
             debugArgs: true,