When I rerender a component with "defaultChecked" or "defaultValue" react fails to update the "value" and "checked" attribute accordingly.

Before you say "use a controlled input" I would argue that this is a bug as it basically disallows uncontrolled forms with "reset" buttons. (It will always reset to whatever the initial default value was).

ReactDOM.render(<span style={style}></span>, div);
      expect(console.error.argsForCall.length).toBe(2);
    });
    it('should warn about styles with numeric string values for non-unitless properties', function() {
      spyOn(console, 'error');
      var div = document.createElement('div');
      var One = React.createClass({
        render: function() {
          return this.props.inline ?
            <span style={{fontSize: '1'}} /> :
            <div style={{fontSize: '1'}} />;
        },
      });
      var Two = React.createClass({
        render: function() {
          return <div style={{fontSize: '1'}} />;
        },
      });
      ReactDOM.render(<One inline={false} />, div);
      expect(console.error.calls.length).toBe(1);
      expect(console.error.argsForCall[0][0]).toBe(
        'Warning: a `div` tag (owner: `One`) was passed a numeric string value ' +
        'for CSS property `fontSize` (value: `1`) which will be treated ' +
        'as a unitless number in a future version of React.'
      );
      
      ReactDOM.render(<One inline={true} />, div);
      expect(console.error.calls.length).toBe(1);
      
      ReactDOM.render(<Two />, div);