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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - JSON.parse should modify configurable non-writable properties."
href="https://bugs.webkit.org/show_bug.cgi?id=163495">163495</a>
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<th>Summary</th>
<td>JSON.parse should modify configurable non-writable properties.
</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 Local Build
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>JavaScriptCore
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>mark.lam@apple.com
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<pre>This is because the JSON.parse spec (see <a href="https://tc39.github.io/ecma262/#sec-json.parse">https://tc39.github.io/ecma262/#sec-json.parse</a> and <a href="https://tc39.github.io/ecma262/#sec-internalizejsonproperty">https://tc39.github.io/ecma262/#sec-internalizejsonproperty</a>) uses CreateDataProperty to set properties that the reviver wants to set. The CreateDataProperty spec (see <a href="https://tc39.github.io/ecma262/#sec-createdataproperty">https://tc39.github.io/ecma262/#sec-createdataproperty</a>) says that it uses [[DefineOwnProperty]] to perform this set. As a result, if the property was configurable to begin with, it's [[Writable]] will be overridden to be true, and the new value should be applied.</pre>
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