[Tests] add --disable-proto=delete tests

See #4.

Author: ljharb

.github/workflows/node-twenties.yml

@@ -12,3 +12,17 @@ jobs:
       range: '>= 20'
       type: minors
       command: npm run tests-only
+
+  no-proto:
+    name: 'node, --disable-proto=delete'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: ljharb/actions/node/install@main
+      - run: NODE_OPTIONS=--disable-proto=delete npm run tests-only
+
+  finisher:
+    needs: [tests, no-proto]
+    name: 'node >= 20'
+    runs-on: ubuntu-latest
+    steps:
+      - run: true