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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [INTL] Use @thisNumberValue instead of `instanceof @Number`"
href="https://bugs.webkit.org/show_bug.cgi?id=156680">156680</a>
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<th>Summary</th>
<td>[INTL] Use @thisNumberValue instead of `instanceof @Number`
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
</td>
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<th>OS</th>
<td>Unspecified
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>JavaScriptCore
</td>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>utatane.tea@gmail.com
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<p>
<div>
<pre>Use @thisNumberValue instead of `instanceof @Number`.
`instanceof @Number` is not enough;
For example, given 2 realms, the object created in one realm does not inherit the Number of another realm.
Another example is that the object which does not inherit Number.
```
var number = new Number(42);
number.__proto__ = null;
```</pre>
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