**Do you want to request a *feature* or report a *bug*?**
Bug

**What is the current behavior?**
I've started recieving this warning about my SVGs which is using [feGaussianBlur](https://developer.mozilla.org/en-US/docs/Web/SVG/Element/feGaussianBlur): 
`Warning: Expected server HTML to contain a matching <feGaussianBlur> in <filter>.`

**What is the expected behavior?**
Should be no warnings because there are no difference.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
Such behavior started right after updating to `React 16.0.0-rc.3` and never happened with `React 15.6.1`
));
      it('can not deeply ignore errors reconnecting different attribute values', () =>
        expectMarkupMismatch(
          <div><div id="foo" /></div>,
          <div suppressHydrationWarning={true}><div id="bar" /></div>,
        ));
    });
    describe('inline styles', function() {
      it('should error reconnecting missing style attribute', () =>
        expectMarkupMismatch(<div style={{width: '1px'}} />, <div />));
      it('should error reconnecting added style attribute', () =>
        expectMarkupMismatch(<div />, <div style={{width: '1px'}} />));
      it('should error reconnecting empty style attribute', () =>
        expectMarkupMismatch(
          <div style={{width: '1px'}} />,
          <div style={{}} />,
        ));
      it('should error reconnecting added style values', () =>
        expectMarkupMismatch(
          <div style={{}} />,
          <div style={{width: '1px'}} />,
        ));
      it('should error reconnecting different style values', () =>
        expectMarkupMismatch(
          <div style={{width: '1px'}} />,
          <div style={{width: '2px'}} />,
        ));
      it('should reconnect number and string versions of a number', () =>
        expectMarkupMatch(
          <div style={{width: '1px', height: 2}} />,