Go ahead and disable type stripping during testing entirely

We'll need to support this soon, since it'll end up being default on
everybody's machine, but right now it breaks a bunch of stuff and it's
not an immediately useful feature.

.github/workflows/ci.yml

@@ -20,7 +20,12 @@ jobs:
           cache-dependency-path: 'package.json'
 
       - run: npm install
+
       - run: npm run ci-tests
+        env:
+          # The new type stripping breaks our existing ts-node testing
+          # set up, so disable it:
+          NODE_OPTIONS: ${{ startsWith(matrix.node-version, '23') && '--no-experimental-strip-types' || '' }}
 
       - name: Deploy docs
         if: github.ref == 'refs/heads/main' && matrix.node-version == 'v20.18.1'