Follow up from https://github.com/facebook/react/pull/11616.

Here's one I found. These two invariants:

https://github.com/facebook/react/blob/7e7127387ba64f57299eaff8656542cea6fb3a2d/packages/react-reconciler/src/ReactFiberClassComponent.js#L330-L343

are in a function that's behind a DEV block:

https://github.com/facebook/react/blob/7e7127387ba64f57299eaff8656542cea6fb3a2d/packages/react-reconciler/src/ReactFiberClassComponent.js#L447-L449

I don't think this is intentional, but need to verify.

There may be more. I'll use this issue to track while https://github.com/facebook/react/pull/11616 preserves existing behavior.
async render => {
          const e = await render(<a title={'foo\rbar\r\nbaz\nqux\u0000'} />);
          if (
            render === serverRender ||
            render === streamRender ||
            render === clientRenderOnServerString
          ) {
            
            
            
            expect(e.title).toBe('foo\nbar\nbaz\nqux\uFFFD');
          } else {
            
            expect(e.title).toBe('foo\rbar\r\nbaz\nqux\u0000');
          }
        },
      );
    });
    describe('components that throw errors', function() {
      itThrowsWhenRendering(
        'a function returning undefined',
        async render => {
          const UndefinedComponent = () => undefined;
          await render(<UndefinedComponent />, 1);
        },
        'UndefinedComponent(...): Nothing was returned from render. ' +
          'This usually means a return statement is missing. Or, to ' +
          'render nothing, return null.',
      );
      itThrowsWhenRendering(