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

**What is the current behavior?**
In React 15.6.1, this behaviour is changed; In 15.5.4, it fires the change event reliably.

15.6.1 - https://codesandbox.io/embed/VPA42ZnRo
15.5.4 - https://codesandbox.io/embed/JZ0mnE5oy

You'll need to have the console open to get the debugger statement.

In 15.6.1, the first change fires, but all subsequent changes do not fire. In 15.5.4, all changes fire.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

React 15.6.1 vs React 15.5.4; Chrome latest stable.

render() {
    return (
      <FixtureSet
        title="Input change events"
        description="Tests proper behavior of the onChange event for inputs">
        <TestCase
          title="Range keyboard changes"
          description={`
            Range inputs should fire onChange events for keyboard events
          `}>
          <TestCase.Steps>
            <li>Focus range input</li>
            <li>change value via the keyboard arrow keys</li>
          </TestCase.Steps>
          <TestCase.ExpectedResult>
            The <code>onKeyDown</code> call count should be equal to
            the <code>onChange</code> call count.
          </TestCase.ExpectedResult>
          <RangeKeyboardFixture />
        </TestCase>
        <TestCase
          title="Radio input clicks"
          description={`
            Radio inputs should only fire change events when the checked
            state changes.
          `}
          resolvedIn="16.0.0">
          <TestCase.Steps>
            <li>Click on the Radio input (or label text)</li>