Improve conformance with DNS behavior

.vscode/launch.json

@@ -0,0 +1,27 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug CoreDNS",
+            "type": "go",
+            "request": "launch",
+            "mode": "exec",
+            "program": "${workspaceFolder}/../coredns/coredns",
+            "args": [],
+            "cwd": "${workspaceFolder}/testdata",
+            "env": {
+                "GOWORK": "${workspaceFolder}/../coredns/go.work"
+            },
+            "preLaunchTask": "Build CoreDNS",
+            "showLog": true
+        },
+        {
+            "name": "Attach to CoreDNS",
+            "type": "go",
+            "request": "attach",
+            "mode": "remote",
+            "port": 2345,
+            "host": "127.0.0.1"
+        }
+    ]
+}

.vscode/tasks.json

@@ -0,0 +1,21 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Build CoreDNS",
+            "type": "shell",
+            "command": "go generate && go build -gcflags='all=-N -l' -o coredns",
+            "options": {
+                "cwd": "${workspaceFolder}/../coredns",
+                "env": {
+                    "GOWORK": "${workspaceFolder}/../coredns/go.work"
+                }
+            },
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "problemMatcher": ["$go"]
+        }
+    ]
+}