diff --git a/README.md b/README.md
index 24b9994..4bdba8f 100644
--- a/README.md
+++ b/README.md
@@ -16,9 +16,9 @@ See the rendered spec at [here](https://tc39.es/proposal-Number.range/).
 
 ## Polyfill
 
-- A polyfill is available in the [core-js](https://github.com/zloirock/core-js) library. You can find it in the [ECMAScript proposals section](https://github.com/zloirock/core-js/#numberrange).
+-   A polyfill is available in the [core-js](https://github.com/zloirock/core-js) library. You can find it in the [ECMAScript proposals section](https://github.com/zloirock/core-js/#numberrange).
 
-- In the proposal repo is available a [a step-to-step implementation of the proposal](./polyfill.js) [![codecov](https://codecov.io/gh/tc39/proposal-Number.range/branch/master/graph/badge.svg)](https://codecov.io/gh/tc39/proposal-Number.range) so you can verify if there is a bug in the specification by the debugger.
+-   In the proposal repo is available a [a step-to-step implementation of the proposal](./polyfill.js) [![codecov](https://codecov.io/gh/tc39/proposal-Number.range/branch/master/graph/badge.svg)](https://codecov.io/gh/tc39/proposal-Number.range) so you can verify if there is a bug in the specification by the debugger.
 
 ## Motivation
 
@@ -93,7 +93,7 @@ function* even() {
 
 # Presentations
 
-- 2020 Apr [Notes](https://github.com/tc39/notes/blob/master/meetings/2020-03/april-1.md#numberrange-and-bigintrange-for-stage-1) [Slides](https://docs.google.com/presentation/d/1JD9SrOEtGEviPYJ3LQGKRqDHYeF-EIt7RHB92hKPWzo/)
+-   2020 Apr [Notes](https://github.com/tc39/notes/blob/master/meetings/2020-03/april-1.md#numberrange-and-bigintrange-for-stage-1) [Slides](https://docs.google.com/presentation/d/1JD9SrOEtGEviPYJ3LQGKRqDHYeF-EIt7RHB92hKPWzo/)
 
 ### Signature
 
diff --git a/index.html b/index.html
index ff41569..a0a54b4 100644
--- a/index.html
+++ b/index.html
@@ -3,7 +3,7 @@
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 var sdoBox = {
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@@ -2284,84 +2284,77 @@
 .normative-optional-tag a {
   color: #884400;
 }
-</style></head><body><div id="menu-toggle">☰</div><div id="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</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-number" title="Number"><span class="secnum">1</span> Number</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-number-range" title="Number.range(start, end, option)"><span class="secnum">1.1</span> Number.range(<var>start</var>, <var>end</var>, <var>option</var>)</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-bigint" title="BigInt"><span class="secnum">2</span> BigInt</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-bigint-range" title="BigInt.range(start, end, option)"><span class="secnum">2.1</span> BigInt.range(<var>start</var>, <var>end</var>, <var>option</var>)</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-algor" title="Algorithms"><span class="secnum">3</span> Algorithms</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-algor-0" title="CreateRangeIterator(start, end, option, type)"><span class="secnum">3.1</span> <dfn>CreateRangeIterator</dfn>(<var>start</var>, <var>end</var>, <var>option</var>, <var>type</var>)</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-rangeiterator-prototype-object" title="Properties of the RangeIterator Prototype Object"><span class="secnum">4</span> Properties of the RangeIterator Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-next" title="%RangeIterator%.next()"><span class="secnum">4.1</span> %RangeIterator%.next()</a></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-@@tostringtag" title="%RangeIteratorPrototype%.[@@toStringTag]"><span class="secnum">4.2</span> %RangeIteratorPrototype%.[@@toStringTag]</a></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-rangeiterator-prototype-object-start" title="%RangeIteratorPrototype%.start"><span class="secnum">4.3</span> %RangeIteratorPrototype%.start</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-start-getter" title="get %RangeIteratorPrototype%.start"><span class="secnum">4.3.1</span> get %RangeIteratorPrototype%.start</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-rangeiterator-prototype-object-end" title="%RangeIteratorPrototype%.end"><span class="secnum">4.4</span> %RangeIteratorPrototype%.end</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-end-getter" title="get %RangeIteratorPrototype%.end"><span class="secnum">4.4.1</span> get %RangeIteratorPrototype%.end</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-rangeiterator-prototype-object-inclusive" title="%RangeIteratorPrototype%.inclusive"><span class="secnum">4.5</span> %RangeIteratorPrototype%.inclusive</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-inclusive-getter" title="get %RangeIteratorPrototype%.inclusive"><span class="secnum">4.5.1</span> get %RangeIteratorPrototype%.inclusive</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-rangeiterator-prototype-object-step" title="%RangeIteratorPrototype%.step"><span class="secnum">4.6</span> %RangeIteratorPrototype%.step</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-step-getter" title="get %RangeIteratorPrototype%.step"><span class="secnum">4.6.1</span> get %RangeIteratorPrototype%.step</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-rangeiterator-slots" title="Internal slots"><span class="secnum">4.7</span> Internal slots</a></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 first">Stage 1 Draft / February 25, 2021</h1><h1 class="title">Proposal Number.range &amp; BigInt.range</h1>
+</style></head><body><div id="menu-toggle">☰</div><div id="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</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-iteraotr" title="Iterator"><span class="secnum">1</span> Iterator</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-number-range" title="Iterator.range.numeric(start, end, option)"><span class="secnum">1.1</span> Iterator.range.numeric(<var>start</var>, <var>end</var>, <var>option</var>)</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-algor" title="Algorithms"><span class="secnum">2</span> Algorithms</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-algor-0" title="CreateNumericRangeIterator(start, end, option)"><span class="secnum">2.1</span> <dfn>CreateNumericRangeIterator</dfn>(<var>start</var>, <var>end</var>, <var>option</var>)</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-rangeiterator-prototype-object" title="Properties of the RangeIterator Prototype Object"><span class="secnum">3</span> Properties of the RangeIterator Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-next" title="%RangeIterator%.next()"><span class="secnum">3.1</span> %RangeIterator%.next()</a></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-@@tostringtag" title="%RangeIteratorPrototype%.[@@toStringTag]"><span class="secnum">3.2</span> %RangeIteratorPrototype%.[@@toStringTag]</a></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-rangeiterator-prototype-object-start" title="%RangeIteratorPrototype%.start"><span class="secnum">3.3</span> %RangeIteratorPrototype%.start</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-start-getter" title="get %RangeIteratorPrototype%.start"><span class="secnum">3.3.1</span> get %RangeIteratorPrototype%.start</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-rangeiterator-prototype-object-end" title="%RangeIteratorPrototype%.end"><span class="secnum">3.4</span> %RangeIteratorPrototype%.end</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-end-getter" title="get %RangeIteratorPrototype%.end"><span class="secnum">3.4.1</span> get %RangeIteratorPrototype%.end</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-rangeiterator-prototype-object-inclusive" title="%RangeIteratorPrototype%.inclusive"><span class="secnum">3.5</span> %RangeIteratorPrototype%.inclusive</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-inclusive-getter" title="get %RangeIteratorPrototype%.inclusive"><span class="secnum">3.5.1</span> get %RangeIteratorPrototype%.inclusive</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-the-rangeiterator-prototype-object-step" title="%RangeIteratorPrototype%.step"><span class="secnum">3.6</span> %RangeIteratorPrototype%.step</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-properties-of-the-rangeiterator-prototype-object-step-getter" title="get %RangeIteratorPrototype%.step"><span class="secnum">3.6.1</span> get %RangeIteratorPrototype%.step</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-rangeiterator-slots" title="Internal slots"><span class="secnum">3.7</span> Internal slots</a></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 first">Stage 1 Draft / February 25, 2021</h1><h1 class="title">Proposal Iterator.range.numeric</h1>
 
-<emu-clause id="sec-number">
-    <h1><span class="secnum">1</span> Number</h1>
+<emu-clause id="sec-iteraotr">
+    <h1><span class="secnum">1</span> Iterator</h1>
     <emu-clause id="sec-number-range">
-        <h1><span class="secnum">1.1</span> Number.range(<var>start</var>, <var>end</var>, <var>option</var>)</h1>
-        <emu-alg><ol><li>Return ?&nbsp;<emu-xref href="#sec-algor-0" id="_ref_0"><a href="#sec-algor-0">CreateRangeIterator</a></emu-xref>(<var>start</var>, <var>end</var>, <var>option</var>, <emu-val>"number"</emu-val>).</li></ol></emu-alg>
-    </emu-clause>
-</emu-clause>
-<emu-clause id="sec-bigint">
-    <h1><span class="secnum">2</span> BigInt</h1>
-    <emu-clause id="sec-bigint-range">
-        <h1><span class="secnum">2.1</span> BigInt.range(<var>start</var>, <var>end</var>, <var>option</var>)</h1>
-        <emu-alg><ol><li>Return ?&nbsp;<emu-xref href="#sec-algor-0" id="_ref_1"><a href="#sec-algor-0">CreateRangeIterator</a></emu-xref>(<var>start</var>, <var>end</var>, <var>option</var>, <emu-val>"bigint"</emu-val>).</li></ol></emu-alg>
+        <h1><span class="secnum">1.1</span> Iterator.range.numeric(<var>start</var>, <var>end</var>, <var>option</var>)</h1>
+        <emu-alg><ol><li>Return ?&nbsp;<emu-xref href="#sec-algor-0" id="_ref_0"><a href="#sec-algor-0">CreateNumericRangeIterator</a></emu-xref>(<var>start</var>, <var>end</var>, <var>option</var>).</li></ol></emu-alg>
     </emu-clause>
 </emu-clause>
 <emu-clause id="sec-algor">
-    <h1><span class="secnum">3</span> Algorithms</h1>
+    <h1><span class="secnum">2</span> Algorithms</h1>
     <emu-clause id="sec-algor-0">
-        <h1><span class="secnum">3.1</span> <dfn>CreateRangeIterator</dfn>(<var>start</var>, <var>end</var>, <var>option</var>, <var>type</var>)</h1>
-        <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_2"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>start</var>) is not <var>type</var>, throw a <emu-val>TypeError</emu-val> exception.</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>type</var> is <emu-val>"number"</emu-val> or <emu-val>"bigint"</emu-val>.</li><li>If <var>type</var> is <emu-val>"bigint"</emu-val>, let <var>zero</var> be <emu-val>0n</emu-val>, else let <var>zero</var> be <emu-val>0</emu-val>.</li><li>If <var>type</var> is <emu-val>"bigint"</emu-val>, let <var>one</var> be <emu-val>1n</emu-val>, else let <var>one</var> be <emu-val>1</emu-val>.</li><li>Note: <emu-note type="editor"><span class="note">Editor's Note</span><div class="note-contents">Allowing all kinds of number (number, bigint, decimals, ...) to range from a finite number to infinity.</div></emu-note></li><li>If <var>end</var> is not <emu-val>+∞</emu-val> or <emu-val>-∞</emu-val> and if <emu-xref aoid="Type" id="_ref_3"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>end</var>) is not <var>type</var>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>start</var> is <emu-val>+∞</emu-val> or <emu-val>-∞</emu-val>, throws a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>ifIncrease</var> be end &gt; start.</li><li>Let <var>inclusiveEnd</var> be <emu-val>false</emu-val>.
-            <!-- Normalize options --></li><li>If <var>option</var> is <emu-val>undefined</emu-val> or <emu-val>null</emu-val>, let <var>step</var> be <emu-val>undefined</emu-val>.</li><li>Else if <emu-xref aoid="Type" id="_ref_4"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>option</var>) is <emu-val>object</emu-val>,<ol><li>Let <var>step</var> be <emu-xref aoid="Get" id="_ref_5"><a href="https://tc39.es/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>option</var>, "step").</li><li>Let <var>inclusiveEnd</var> be <emu-xref aoid="ToBoolean" id="_ref_6"><a href="https://tc39.es/ecma262/#sec-toboolean">ToBoolean</a></emu-xref>(<emu-xref aoid="Get" id="_ref_7"><a href="https://tc39.es/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>option</var>, "inclusive")).</li></ol></li><li>Else if <emu-xref aoid="Type" id="_ref_8"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>option</var>) is <var>type</var>, let <var>step</var> be <var>option</var>.</li><li>Else, throw a <emu-val>TypeError</emu-val> exception.
-            <!-- Normalize options end --></li><li>If <var>step</var> is <emu-val>undefined</emu-val> or <emu-val>null</emu-val>,<ol><li>If <var>ifIncrease</var> is <emu-val>true</emu-val>, let <var>step</var> be <var>one</var>.</li><li>Else let <var>step</var> be -<var>one</var>.</li></ol></li><li>If <emu-xref aoid="Type" id="_ref_9"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>step</var>) is not <var>type</var>, throws a <emu-val>TypeError</emu-val> exception.</li><li>If <var>step</var> is <emu-val>+∞</emu-val> or <emu-val>-∞</emu-val>, throws a <emu-val>RangeError</emu-val> exception.</li><li>If <var>step</var> is <var>zero</var> and <var>start</var> is not equal to <var>end</var>, throws an <emu-val>RangeError</emu-val> exception.</li><li>Let <var>closure</var> be a new Abstract Closure with no parameters that captures <var>start</var>, <var>end</var>, <var>step</var>, <var>type</var>, <var>inclusiveEnd</var>, <var>zero</var>, <var>one</var> and performs the following steps when called:
+        <h1><span class="secnum">2.1</span> <dfn>CreateNumericRangeIterator</dfn>(<var>start</var>, <var>end</var>, <var>option</var>)</h1>
+        <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_1"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>start</var>) is not <var>type</var>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>type</var> be TypeOf(<var>start</var>).</li><li>If <var>type</var> is not <emu-val>"number"</emu-val> or <emu-val>"bigint"</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>type</var> is <emu-val>"bigint"</emu-val>, let <var>zero</var> be <emu-val>0n</emu-val>, else let <var>zero</var> be <emu-val>0</emu-val>.</li><li>If <var>type</var> is <emu-val>"bigint"</emu-val>, let <var>one</var> be <emu-val>1n</emu-val>, else let <var>one</var> be <emu-val>1</emu-val>.</li><li>Note: <emu-note type="editor"><span class="note">Editor's Note</span><div class="note-contents">Allowing all kinds of number (number, bigint, decimals, ...) to range from a finite number to infinity.</div></emu-note></li><li>If <var>end</var> is not <emu-val>+∞</emu-val> or <emu-val>-∞</emu-val> and if <emu-xref aoid="Type" id="_ref_2"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>end</var>) is not <var>type</var>, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>start</var> is <emu-val>+∞</emu-val> or <emu-val>-∞</emu-val>, throws a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>ifIncrease</var> be end &gt; start.</li><li>Let <var>inclusiveEnd</var> be <emu-val>false</emu-val>.
+            <!-- Normalize options --></li><li>If <var>option</var> is <emu-val>undefined</emu-val> or <emu-val>null</emu-val>, let <var>step</var> be <emu-val>undefined</emu-val>.</li><li>Else if <emu-xref aoid="Type" id="_ref_3"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>option</var>) is <emu-val>object</emu-val>,<ol><li>Let <var>step</var> be <emu-xref aoid="Get" id="_ref_4"><a href="https://tc39.es/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>option</var>, "step").</li><li>Let <var>inclusiveEnd</var> be <emu-xref aoid="ToBoolean" id="_ref_5"><a href="https://tc39.es/ecma262/#sec-toboolean">ToBoolean</a></emu-xref>(<emu-xref aoid="Get" id="_ref_6"><a href="https://tc39.es/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>option</var>, "inclusive")).</li></ol></li><li>Else if <emu-xref aoid="Type" id="_ref_7"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>option</var>) is <var>type</var>, let <var>step</var> be <var>option</var>.</li><li>Else, throw a <emu-val>TypeError</emu-val> exception.
+            <!-- Normalize options end --></li><li>If <var>step</var> is <emu-val>undefined</emu-val> or <emu-val>null</emu-val>,<ol><li>If <var>ifIncrease</var> is <emu-val>true</emu-val>, let <var>step</var> be <var>one</var>.</li><li>Else let <var>step</var> be -<var>one</var>.</li></ol></li><li>If <emu-xref aoid="Type" id="_ref_8"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>step</var>) is not <var>type</var>, throws a <emu-val>TypeError</emu-val> exception.</li><li>If <var>step</var> is <emu-val>+∞</emu-val> or <emu-val>-∞</emu-val>, throws a <emu-val>RangeError</emu-val> exception.</li><li>If <var>step</var> is <var>zero</var> and <var>start</var> is not equal to <var>end</var>, throws an <emu-val>RangeError</emu-val> exception.</li><li>Let <var>closure</var> be a new Abstract Closure with no parameters that captures <var>start</var>, <var>end</var>, <var>step</var>, <var>type</var>, <var>inclusiveEnd</var>, <var>zero</var>, <var>one</var> and performs the following steps when called:
                 <!-- Early return --><ol><li>If <var>start</var> is <emu-val>NaN</emu-val>, return <emu-val>undefined</emu-val>.</li><li>If <var>end</var> is <emu-val>NaN</emu-val>, return <emu-val>undefined</emu-val>.</li><li>If <var>step</var> is <emu-val>NaN</emu-val>, return <emu-val>undefined</emu-val>.
                 <!-- Direction mismatch --></li><li>Let <var>ifIncrease</var> be <var>end</var> &gt; <var>start</var>.</li><li>Let <var>ifStepIncrease</var> to be <var>step</var> &gt; <var>zero</var>.</li><li>If <var>ifIncrease</var> is not equal to <var>ifStepIncrease</var>, return <emu-val>undefined</emu-val>.
                 <!-- Yield numbers --></li><li>Let <var>hitsEnd</var> be <emu-val>false</emu-val>.</li><li>Let <var>currentCount</var> be <var>zero</var>.</li><li>Note: Debug these step at https://tc39.es/proposal-Number.range/playground.html</li><li>Repeat, while <var>hitsEnd</var> is <emu-val>false</emu-val>:<ol><li>Let <var>currentYieldingValue</var> be <var>start</var> + (<var>step</var> * <var>currentCount</var>).</li><li>If <var>currentYieldingValue</var> equal to <var>end</var>, Set <var>hitsEnd</var> to <emu-val>true</emu-val>.</li><li>Set <var>currentCount</var> to <var>currentCount</var> + <var>one</var>
                     <!-- Prevent value overflow --></li><li>Let <var>endCondition</var> be <emu-val>false</emu-val>.</li><li>If <var>ifIncrease</var> is <emu-val>true</emu-val><ol><li>If <var>inclusiveEnd</var> is <emu-val>true</emu-val>, set <var>endCondition</var> be <var>currentYieldingValue</var> &gt; <var>end</var></li><li>Else set <var>endCondition</var> be <var>currentYieldingValue</var> &gt;= <var>end</var>.</li></ol></li><li>Else<ol><li>If <var>inclusiveEnd</var> is <emu-val>true</emu-val>, set <var>endCondition</var> be <var>end</var> &gt; <var>currentYieldingValue</var></li><li>Else set <var>endCondition</var> be <var>end</var> &gt;= <var>currentYieldingValue</var>.</li></ol></li><li>If <var>endCondition</var> is <emu-val>true</emu-val>, return <emu-val>undefined</emu-val>.</li><li>Perform ?&nbsp;Yield(<var>currentYieldingValue</var>).</li></ol></li><li>Return <emu-val>undefined</emu-val>.
-                <!-- Finish --></li></ol></li><li>Let <var>iterator</var> be !&nbsp;CreateIteratorFromClosure(<var>closure</var>, <emu-const>Range Iterator</emu-const>, <emu-xref href="#sec-properties-of-the-rangeiterator-prototype-object" id="_ref_10"><a href="#sec-properties-of-the-rangeiterator-prototype-object">%RangeIteratorPrototype%</a></emu-xref>, « start, end, step, inclusiveEnd »).</li><li>Set <var>iterator</var>.[[start]] to <var>start</var>.</li><li>Set <var>iterator</var>.[[end]] to <var>end</var>.</li><li>Set <var>iterator</var>.[[step]] to <var>step</var>.</li><li>Set <var>iterator</var>.[[inclusiveEnd]] to <var>inclusiveEnd</var>.</li><li>Return <var>iterator</var>.</li></ol></emu-alg>
+                <!-- Finish --></li></ol></li><li>Let <var>iterator</var> be !&nbsp;CreateIteratorFromClosure(<var>closure</var>, <emu-const>Range Iterator</emu-const>, <emu-xref href="#sec-properties-of-the-rangeiterator-prototype-object" id="_ref_9"><a href="#sec-properties-of-the-rangeiterator-prototype-object">%RangeIteratorPrototype%</a></emu-xref>, « start, end, step, inclusiveEnd »).</li><li>Set <var>iterator</var>.[[start]] to <var>start</var>.</li><li>Set <var>iterator</var>.[[end]] to <var>end</var>.</li><li>Set <var>iterator</var>.[[step]] to <var>step</var>.</li><li>Set <var>iterator</var>.[[inclusiveEnd]] to <var>inclusiveEnd</var>.</li><li>Return <var>iterator</var>.</li></ol></emu-alg>
     </emu-clause>
 </emu-clause>
 
 <emu-clause id="sec-properties-of-the-rangeiterator-prototype-object">
-    <h1><span class="secnum">4</span> Properties of the RangeIterator Prototype Object</h1>
+    <h1><span class="secnum">3</span> Properties of the RangeIterator Prototype Object</h1>
     <p>The RangeIterator prototype object is the intrinsic object <dfn>%RangeIteratorPrototype%</dfn>.</p>
     <p>The value has a [[Prototype]] internal slot whose value is the intrinsic object <emu-xref href="#sec-%iteratorprototype%-object"><a href="https://tc39.es/ecma262/#sec-%iteratorprototype%-object">%IteratorPrototype%</a></emu-xref>.</p>
     <emu-clause id="sec-properties-of-the-rangeiterator-prototype-object-next">
-        <h1><span class="secnum">4.1</span> %RangeIterator%.next()</h1>
-        <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="GeneratorResume" id="_ref_11"><a href="https://tc39.es/ecma262/#sec-generatorresume">GeneratorResume</a></emu-xref>(<emu-val>this</emu-val> value, <emu-val>undefined</emu-val>, <emu-const>Range Iterator</emu-const>).</li></ol></emu-alg>
+        <h1><span class="secnum">3.1</span> %RangeIterator%.next()</h1>
+        <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="GeneratorResume" id="_ref_10"><a href="https://tc39.es/ecma262/#sec-generatorresume">GeneratorResume</a></emu-xref>(<emu-val>this</emu-val> value, <emu-val>undefined</emu-val>, <emu-const>Range Iterator</emu-const>).</li></ol></emu-alg>
     </emu-clause>
     <emu-clause id="sec-properties-of-the-rangeiterator-prototype-object-@@tostringtag">
-        <h1><span class="secnum">4.2</span> %RangeIteratorPrototype%.[@@toStringTag]</h1>
+        <h1><span class="secnum">3.2</span> %RangeIteratorPrototype%.[@@toStringTag]</h1>
         <p>The initial value of the @@toStringTag property is the String value <code>"RangeIterator"</code>.</p>
         <p>This property has the attributes { [[Writable]]: <emu-val>false</emu-val>, [[Enumerable]]: <emu-val>false</emu-val>, [[Configurable]]: <emu-val>true</emu-val> }.</p>
     </emu-clause>
     <emu-clause id="sec-properties-of-the-rangeiterator-prototype-object-start">
-        <h1><span class="secnum">4.3</span> %RangeIteratorPrototype%.start</h1>
-        <p><emu-xref href="#sec-properties-of-the-rangeiterator-prototype-object" id="_ref_12"><a href="#sec-properties-of-the-rangeiterator-prototype-object">%RangeIteratorPrototype%</a></emu-xref>.start is an <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">accessor property</a></emu-xref> with attributes { [[Enumerable]]: false, [[Configurable]]: <emu-val>true</emu-val>}. The [[Get]] attribute is defined as follows: </p>
+        <h1><span class="secnum">3.3</span> %RangeIteratorPrototype%.start</h1>
+        <p><emu-xref href="#sec-properties-of-the-rangeiterator-prototype-object" id="_ref_11"><a href="#sec-properties-of-the-rangeiterator-prototype-object">%RangeIteratorPrototype%</a></emu-xref>.start is an <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">accessor property</a></emu-xref> with attributes { [[Enumerable]]: false, [[Configurable]]: <emu-val>true</emu-val>}. The [[Get]] attribute is defined as follows: </p>
         <emu-clause id="sec-properties-of-the-rangeiterator-prototype-object-start-getter">
-            <h1><span class="secnum">4.3.1</span> get %RangeIteratorPrototype%.start</h1>
-            <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_13"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<emu-val>this</emu-val>, [[start]]).</li><li>Return <emu-val>this</emu-val>.[[start]].</li></ol></emu-alg>
+            <h1><span class="secnum">3.3.1</span> get %RangeIteratorPrototype%.start</h1>
+            <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_12"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<emu-val>this</emu-val>, [[start]]).</li><li>Return <emu-val>this</emu-val>.[[start]].</li></ol></emu-alg>
         </emu-clause>
     </emu-clause>
     <emu-clause id="sec-properties-of-the-rangeiterator-prototype-object-end">
-        <h1><span class="secnum">4.4</span> %RangeIteratorPrototype%.end</h1>
-        <p><emu-xref href="#sec-properties-of-the-rangeiterator-prototype-object" id="_ref_14"><a href="#sec-properties-of-the-rangeiterator-prototype-object">%RangeIteratorPrototype%</a></emu-xref>.end is an <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">accessor property</a></emu-xref> with attributes { [[Enumerable]]: false, [[Configurable]]: <emu-val>true</emu-val>}. The [[Get]] attribute is defined as follows: </p>
+        <h1><span class="secnum">3.4</span> %RangeIteratorPrototype%.end</h1>
+        <p><emu-xref href="#sec-properties-of-the-rangeiterator-prototype-object" id="_ref_13"><a href="#sec-properties-of-the-rangeiterator-prototype-object">%RangeIteratorPrototype%</a></emu-xref>.end is an <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">accessor property</a></emu-xref> with attributes { [[Enumerable]]: false, [[Configurable]]: <emu-val>true</emu-val>}. The [[Get]] attribute is defined as follows: </p>
         <emu-clause id="sec-properties-of-the-rangeiterator-prototype-object-end-getter">
-            <h1><span class="secnum">4.4.1</span> get %RangeIteratorPrototype%.end</h1>
-            <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_15"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<emu-val>this</emu-val>, [[end]]).</li><li>Return <emu-val>this</emu-val>.[[end]].</li></ol></emu-alg>
+            <h1><span class="secnum">3.4.1</span> get %RangeIteratorPrototype%.end</h1>
+            <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_14"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<emu-val>this</emu-val>, [[end]]).</li><li>Return <emu-val>this</emu-val>.[[end]].</li></ol></emu-alg>
         </emu-clause>
     </emu-clause>
     <emu-clause id="sec-properties-of-the-rangeiterator-prototype-object-inclusive">
-        <h1><span class="secnum">4.5</span> %RangeIteratorPrototype%.inclusive</h1>
-        <p><emu-xref href="#sec-properties-of-the-rangeiterator-prototype-object" id="_ref_16"><a href="#sec-properties-of-the-rangeiterator-prototype-object">%RangeIteratorPrototype%</a></emu-xref>.inclusive is an <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">accessor property</a></emu-xref> with attributes { [[Enumerable]]: false, [[Configurable]]: <emu-val>true</emu-val>}. The [[Get]] attribute is defined as follows: </p>
+        <h1><span class="secnum">3.5</span> %RangeIteratorPrototype%.inclusive</h1>
+        <p><emu-xref href="#sec-properties-of-the-rangeiterator-prototype-object" id="_ref_15"><a href="#sec-properties-of-the-rangeiterator-prototype-object">%RangeIteratorPrototype%</a></emu-xref>.inclusive is an <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">accessor property</a></emu-xref> with attributes { [[Enumerable]]: false, [[Configurable]]: <emu-val>true</emu-val>}. The [[Get]] attribute is defined as follows: </p>
         <emu-clause id="sec-properties-of-the-rangeiterator-prototype-object-inclusive-getter">
-            <h1><span class="secnum">4.5.1</span> get %RangeIteratorPrototype%.inclusive</h1>
-            <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_17"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<emu-val>this</emu-val>, [[inclusive]]).</li><li>Return <emu-val>this</emu-val>.[[inclusiveEnd]].</li></ol></emu-alg>
+            <h1><span class="secnum">3.5.1</span> get %RangeIteratorPrototype%.inclusive</h1>
+            <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_16"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<emu-val>this</emu-val>, [[inclusive]]).</li><li>Return <emu-val>this</emu-val>.[[inclusiveEnd]].</li></ol></emu-alg>
         </emu-clause>
     </emu-clause>
     <emu-clause id="sec-properties-of-the-rangeiterator-prototype-object-step">
-        <h1><span class="secnum">4.6</span> %RangeIteratorPrototype%.step</h1>
-        <p><emu-xref href="#sec-properties-of-the-rangeiterator-prototype-object" id="_ref_18"><a href="#sec-properties-of-the-rangeiterator-prototype-object">%RangeIteratorPrototype%</a></emu-xref>.step is an <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">accessor property</a></emu-xref> with attributes { [[Enumerable]]: false, [[Configurable]]: <emu-val>true</emu-val>}. The [[Get]] attribute is defined as follows: </p>
+        <h1><span class="secnum">3.6</span> %RangeIteratorPrototype%.step</h1>
+        <p><emu-xref href="#sec-properties-of-the-rangeiterator-prototype-object" id="_ref_17"><a href="#sec-properties-of-the-rangeiterator-prototype-object">%RangeIteratorPrototype%</a></emu-xref>.step is an <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">accessor property</a></emu-xref> with attributes { [[Enumerable]]: false, [[Configurable]]: <emu-val>true</emu-val>}. The [[Get]] attribute is defined as follows: </p>
         <emu-clause id="sec-properties-of-the-rangeiterator-prototype-object-step-getter">
-            <h1><span class="secnum">4.6.1</span> get %RangeIteratorPrototype%.step</h1>
-            <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_19"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<emu-val>this</emu-val>, [[step]]).</li><li>Return <emu-val>this</emu-val>.[[step]].</li></ol></emu-alg>
+            <h1><span class="secnum">3.6.1</span> get %RangeIteratorPrototype%.step</h1>
+            <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot" id="_ref_18"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<emu-val>this</emu-val>, [[step]]).</li><li>Return <emu-val>this</emu-val>.[[step]].</li></ol></emu-alg>
         </emu-clause>
     </emu-clause>
     <emu-clause id="sec-rangeiterator-slots">
-        <h1><span class="secnum">4.7</span> Internal slots</h1>
+        <h1><span class="secnum">3.7</span> Internal slots</h1>
         <emu-table id="sec-rangeiterator-internal-slots" caption="Internal slots"><figure><figcaption>Table 1: Internal slots</figcaption>
             <table>
             <thead>
diff --git a/spec.emu b/spec.emu
index afe9d1a..8dc8de4 100644
--- a/spec.emu
+++ b/spec.emu
@@ -4,36 +4,28 @@
 <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.4/styles/github.min.css" />
 <script src="./spec.js"></script>
 <pre class="metadata">
-title: Proposal Number.range & BigInt.range
+title: Proposal Iterator.range.numeric
 stage: 1
 contributors: "Jack Works"
 </pre>
 
-<emu-clause id="sec-number">
-    <h1>Number</h1>
+<emu-clause id="sec-iteraotr">
+    <h1>Iterator</h1>
     <emu-clause id="sec-number-range">
-        <h1>Number.range(_start_, _end_, _option_)</h1>
+        <h1>Iterator.range.numeric(_start_, _end_, _option_)</h1>
         <emu-alg>
-            1. Return ? CreateRangeIterator(_start_, _end_, _option_, *"number"*).
-        </emu-alg>
-    </emu-clause>
-</emu-clause>
-<emu-clause id="sec-bigint">
-    <h1>BigInt</h1>
-    <emu-clause id="sec-bigint-range">
-        <h1>BigInt.range(_start_, _end_, _option_)</h1>
-        <emu-alg>
-            1. Return ? CreateRangeIterator(_start_, _end_, _option_, *"bigint"*).
+            1. Return ? CreateNumericRangeIterator(_start_, _end_, _option_).
         </emu-alg>
     </emu-clause>
 </emu-clause>
 <emu-clause id="sec-algor">
     <h1>Algorithms</h1>
     <emu-clause id="sec-algor-0">
-        <h1><dfn>CreateRangeIterator</dfn>(_start_, _end_, _option_, _type_)</h1>
+        <h1><dfn>CreateNumericRangeIterator</dfn>(_start_, _end_, _option_)</h1>
         <emu-alg>
             1. If Type(_start_) is not _type_, throw a *TypeError* exception.
-            1. Assert: _type_ is *"number"* or *"bigint"*.
+            1. Let _type_ be TypeOf(_start_).
+            1. If _type_ is not *"number"* or *"bigint"*, throw a *TypeError* exception.
             1. If _type_ is *"bigint"*, let _zero_ be *0n*, else let _zero_ be *0*.
             1. If _type_ is *"bigint"*, let _one_ be *1n*, else let _one_ be *1*.
             1. Note: <emu-note type="editor">Allowing all kinds of number (number, bigint, decimals, ...) to range from a finite number to infinity.</emu-note>