We purge it [here](https://github.com/facebook/react/blob/b11540ccb2321aeb7259fcf0b3a38aeeea35231d/src/isomorphic/ReactDebugTool.js#L88-L89) but this code doesn’t run because of the [early exit](https://github.com/facebook/react/blob/b11540ccb2321aeb7259fcf0b3a38aeeea35231d/src/isomorphic/ReactDebugTool.js#L53-L57).

Need to fix this and add a test case to make sure we don’t regress on it.

instanceID: inst._debugID,
          type: 'remove attribute',
          payload: 'disabled',
        }]);
      });
    });
    describe('custom attribute', () => {
      it('gets recorded during mount', () => {
        var node = document.createElement('div');
        ReactDOM.render(<div data-x="rad" data-y={42} />, node);
        var inst = ReactDOMComponentTree.getInstanceFromNode(node.firstChild);
        if (ReactDOMFeatureFlags.useCreateElement) {
          assertHistoryMatches([{
            instanceID: inst._debugID,
            type: 'update attribute',
            payload: { 'data-x': 'rad' },
          }, {
            instanceID: inst._debugID,
            type: 'update attribute',
            payload: { 'data-y': 42 },
          }, {
            instanceID: inst._debugID,
            type: 'mount',
            payload: 'DIV',
          }]);
        } else {
          assertHistoryMatches([{
            instanceID: inst._debugID,
            type: 'mount',
            payload: '<div data-x="rad" data-y="42" data-reactroot="" ' +