Fix controlled radios, maybe for real this time

Fixes #26876 for real?

In 18.2.0 (last stable), we set .checked unconditionally:

https://github.com/facebook/react/blob/v18.2.0/packages/react-dom/src/client/ReactDOMInput.js#L129-L135

This is important because if we are updating two radios' checkedness from (false, true) to (true, false), we need to make sure that input2.checked is explicitly set to false, even though setting `input1.checked = true` already unchecks input2.

I think this fix is not complete because there is no guarantee that all the inputs rerender at the same time? Hence the TODO. But in practice they usually would and I _think_ this is comparable to what we had before.

Also treating function and symbol as false like we used to and like we do on initial mount.

packages/react-dom-bindings/src/client/ReactDOMInput.js

@@ -175,8 +175,11 @@ export function updateInput(
     }
   }
 
-  if (checked != null && node.checked !== !!checked) {
-    node.checked = checked;
+  if (checked != null) {
+    // Important to set this even if it's not a change in order to update input
+    // value tracking with radio buttons
+    node.checked =
+      checked && typeof checked !== 'function' && typeof checked !== 'symbol';
   }
 
   if (

packages/react-dom/src/__tests__/ReactDOMInput-test.js

@@ -1414,6 +1414,83 @@ describe('ReactDOMInput', () => {
     assertInputTrackingIsCurrent(container);
   });
 
+  it('should control radio buttons if the tree updates during render (case 2; #26876)', () => {
+    let thunk = null;
+    function App() {
+      const [disabled, setDisabled] = React.useState(false);
+      const [value, setValue] = React.useState('one');
+      function handleChange(e) {
+        setDisabled(true);
+        // Pretend this is in a setTimeout or something
+        thunk = () => {
+          setDisabled(false);
+          setValue(e.target.value);
+        };
+      }
+      return (
+        <>
+          <input
+            type="radio"
+            name="fruit"
+            value="one"
+            checked={value === 'one'}
+            onChange={handleChange}
+            disabled={disabled}
+          />
+          <input
+            type="radio"
+            name="fruit"
+            value="two"
+            checked={value === 'two'}
+            onChange={handleChange}
+            disabled={disabled}
+          />
+        </>
+      );
+    }
+    ReactDOM.render(<App />, container);
+    const [one, two] = container.querySelectorAll('input');
+    expect(one.checked).toBe(true);
+    expect(two.checked).toBe(false);
+    expect(isCheckedDirty(one)).toBe(true);
+    expect(isCheckedDirty(two)).toBe(true);
+    assertInputTrackingIsCurrent(container);
+
+    // Click two
+    setUntrackedChecked.call(two, true);
+    dispatchEventOnNode(two, 'click');
+    expect(one.checked).toBe(true);
+    expect(two.checked).toBe(false);
+    expect(isCheckedDirty(one)).toBe(true);
+    expect(isCheckedDirty(two)).toBe(true);
+    assertInputTrackingIsCurrent(container);
+
+    // After a delay...
+    ReactDOM.unstable_batchedUpdates(thunk);
+    expect(one.checked).toBe(false);
+    expect(two.checked).toBe(true);
+    expect(isCheckedDirty(one)).toBe(true);
+    expect(isCheckedDirty(two)).toBe(true);
+    assertInputTrackingIsCurrent(container);
+
+    // Click back to one
+    setUntrackedChecked.call(one, true);
+    dispatchEventOnNode(one, 'click');
+    expect(one.checked).toBe(false);
+    expect(two.checked).toBe(true);
+    expect(isCheckedDirty(one)).toBe(true);
+    expect(isCheckedDirty(two)).toBe(true);
+    assertInputTrackingIsCurrent(container);
+
+    // After a delay...
+    ReactDOM.unstable_batchedUpdates(thunk);
+    expect(one.checked).toBe(true);
+    expect(two.checked).toBe(false);
+    expect(isCheckedDirty(one)).toBe(true);
+    expect(isCheckedDirty(two)).toBe(true);
+    assertInputTrackingIsCurrent(container);
+  });
+
   it('should warn with value and no onChange handler and readOnly specified', () => {
     ReactDOM.render(
       <input type="text" value="zoink" readOnly={true} />,