Stage 3

 - tc39/proposals@6db6ffb
 - #7

Author: ljharb

README.md

@@ -3,7 +3,7 @@ ECMAScript Proposal, specs, and reference implementation for `Error.isError`
 
 Spec drafted by [@ljharb](https://github.com/ljharb).
 
-This proposal is currently Stage 2.7 of the [process](https://tc39.github.io/process-document/).
+This proposal is currently Stage 3 of the [process](https://tc39.github.io/process-document/).
 
 ## Rationale
 I brought up concerns to the committee about `Symbol.toStringTag`, and how previously reliable and unspoofable `Object#toString` calls would now no longer be reliable. The committee consensus was that as long as there were prototype methods for all builtins that, at the least, threw an error when an internal slot was not present, that would be sufficient to serve as a reliable branding test.

index.html

@@ -3308,7 +3308,7 @@
 </ul></div><div id="menu-toggle"><svg xmlns="http://www.w3.org/2000/svg" style="width:100%; height:100%; stroke:currentColor" viewBox="0 0 120 120" width="54" height="54">
       <title>Menu</title>
       <path stroke-width="10" stroke-linecap="round" d="M30,60 h60  M30,30 m0,5 h60  M30,90 m0,-5 h60"></path>
-    </svg></div><div id="menu-spacer" class="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins<button class="unpin-all">clear</button></div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-fundamental-objects" title="Fundamental Objects"><span class="secnum">20</span> Fundamental Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-error-objects" title="Error Objects"><span class="secnum">20.5</span> Error Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-error-constructor" title="Properties of the Error Constructor"><span class="secnum">20.5.2</span> Properties of the Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-error.iserror" title="Error.isError ( arg )"><span class="secnum">20.5.2.1</span> Error.isError ( <var>arg</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations-for-error-objects" title="Abstract Operations for Error Objects"><span class="secnum">20.5.8</span> Abstract Operations for Error Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iserror" title="IsError ( argument )"><span class="secnum">20.5.8.2</span> IsError ( <var>argument</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">A</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 2.7 Draft / November 11, 2024</h1><h1 class="title">Error.isError</h1>
+    </svg></div><div id="menu-spacer" class="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins<button class="unpin-all">clear</button></div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-fundamental-objects" title="Fundamental Objects"><span class="secnum">20</span> Fundamental Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-error-objects" title="Error Objects"><span class="secnum">20.5</span> Error Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-error-constructor" title="Properties of the Error Constructor"><span class="secnum">20.5.2</span> Properties of the Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-error.iserror" title="Error.isError ( arg )"><span class="secnum">20.5.2.1</span> Error.isError ( <var>arg</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations-for-error-objects" title="Abstract Operations for Error Objects"><span class="secnum">20.5.8</span> Abstract Operations for Error Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iserror" title="IsError ( argument )"><span class="secnum">20.5.8.2</span> IsError ( <var>argument</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">A</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 3 Draft / December 2, 2024</h1><h1 class="title">Error.isError</h1>
 
 <emu-clause id="sec-fundamental-objects" number="20">
 	<h1><span class="secnum">20</span> Fundamental Objects</h1>

spec.emu

@@ -2,7 +2,7 @@
 <meta charset="utf8">
 <pre class="metadata">
 title: Error.isError
-stage: 2.7
+stage: 3
 contributors: Jordan Harband
 </pre>