Fix DOMProperty bitmask checking

[BinaryMuse]

[Was previously "Fix HAS_POSITIVE_NUMERIC_VALUE properties" — code and title updated to fix underlying problem]

The bitmask checks in DOMProperty do not properly handle masks with more than one bit set; specifically, properties marked HAS_NUMERIC_VALUE are also passing tests for HAS_POSITIVE_NUMERIC_VALUE, introduced in 5c9d616.

This bug manifests when attempting to use the start attribute on an ordered list to make the list start at 0. The following test case (also available on JSFiddle demonstrates):

<div id="list-1"></div>
<div id="list-2"></div>
<div id="list-3"></div>
<p>HTML starting at 0:
    <ol start="0">
        <li>First</li>
        <li>Second</li>
        <li>Third</li>
    </ol>
</p>

/** @jsx React.DOM */

var List = React.createClass({
    render: function() {
        return (
            <p>React starting at {this.props.start}:
                <ol start={this.props.start}>
                    <li>First</li>
                    <li>Second</li>
                    <li>Third</li>
                </ol>
            </p>
        );
    }
});

React.renderComponent(<List start="1" />, document.getElementById("list-1"));
React.renderComponent(<List start="0" />, document.getElementById("list-2"));
React.renderComponent(<List start="5" />, document.getElementById("list-3"));

The output of the above is:

React starting at 1:

  1. First
  2. Second
  3. Third

React starting at 0:

  1. First
  2. Second
  3. Third

React starting at 5:

  5. First
  6. Second
  7. Third

HTML starting at 0:

  0. First
  1. Second
  2. Third

[zpao]

Seems like a good move. cc @yungsters

[zpao]

Thanks!