From b0cb9429a0e3cd1b7531a1e7475195e1d20f011e Mon Sep 17 00:00:00 2001
From: Dominic Farolino <domfarolino@gmail.com>
Date: Tue, 3 Sep 2024 17:34:45 +0000
Subject: [PATCH] Spec the `reduce()` operator (#171)

SHA: d7bc48b700220a3f6efa682d561b11656551c66e
Reason: push, by domfarolino

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 index.html | 161 +++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 113 insertions(+), 48 deletions(-)

diff --git a/index.html b/index.html
index bfc18bb..4393ceb 100644
--- a/index.html
+++ b/index.html
@@ -6,7 +6,7 @@
   <link href="https://www.w3.org/StyleSheets/TR/2021/cg-draft" rel="stylesheet">
   <meta content="Bikeshed version 82ce88815, updated Thu Sep 7 16:33:55 2023 -0700" name="generator">
   <link href="https://wicg.github.io/observable/" rel="canonical">
-  <meta content="35be035423a6234e832f86f4d4da82dcecdb0bae" name="document-revision">
+  <meta content="d7bc48b700220a3f6efa682d561b11656551c66e" name="document-revision">
 <style>
 /* Put nice boxes around each algorithm. */
 [data-algorithm]:not(.heading) {
@@ -901,7 +901,7 @@
   <div class="head">
    <p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2021/logos/W3C" width="72"> </a> </p>
    <h1 class="p-name no-ref" id="title">Observable</h1>
-   <p id="w3c-state"><a href="https://www.w3.org/standards/types#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2024-08-28">28 August 2024</time></p>
+   <p id="w3c-state"><a href="https://www.w3.org/standards/types#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2024-09-03">3 September 2024</time></p>
    <div data-fill-with="spec-metadata">
     <dl>
      <dt>This version:
@@ -1152,11 +1152,11 @@ <h3 class="heading settled" data-level="2.2" id="observable-api"><span class="se
 };
 
 <c- b>callback</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="callback" data-export id="callbackdef-predicate"><code><c- g>Predicate</c-></code></dfn> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①"><c- b>boolean</c-></a> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any⑤"><c- b>any</c-></a> <dfn class="idl-code" data-dfn-for="Predicate" data-dfn-type="argument" data-export id="dom-predicate-value"><code><c- g>value</c-></code><a class="self-link" href="#dom-predicate-value"></a></dfn>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="Predicate" data-dfn-type="argument" data-export id="dom-predicate-index"><code><c- g>index</c-></code><a class="self-link" href="#dom-predicate-index"></a></dfn>);
-<c- b>callback</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="callback" data-export id="callbackdef-reducer"><code><c- g>Reducer</c-></code></dfn> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any⑥"><c- b>any</c-></a> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any⑦"><c- b>any</c-></a> <dfn class="idl-code" data-dfn-for="Reducer" data-dfn-type="argument" data-export id="dom-reducer-accumulator"><code><c- g>accumulator</c-></code><a class="self-link" href="#dom-reducer-accumulator"></a></dfn>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any⑧"><c- b>any</c-></a> <dfn class="idl-code" data-dfn-for="Reducer" data-dfn-type="argument" data-export id="dom-reducer-currentvalue"><code><c- g>currentValue</c-></code><a class="self-link" href="#dom-reducer-currentvalue"></a></dfn>);
-<c- b>callback</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="callback" data-export id="callbackdef-mapper"><code><c- g>Mapper</c-></code></dfn> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any⑨"><c- b>any</c-></a> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any①⓪"><c- b>any</c-></a> <dfn class="idl-code" data-dfn-for="Mapper" data-dfn-type="argument" data-export id="dom-mapper-value"><code><c- g>value</c-></code><a class="self-link" href="#dom-mapper-value"></a></dfn>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="Mapper" data-dfn-type="argument" data-export id="dom-mapper-index"><code><c- g>index</c-></code><a class="self-link" href="#dom-mapper-index"></a></dfn>);
+<c- b>callback</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="callback" data-export id="callbackdef-reducer"><code><c- g>Reducer</c-></code></dfn> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any⑥"><c- b>any</c-></a> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any⑦"><c- b>any</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Reducer" data-dfn-type="argument" data-export id="dom-reducer-accumulator"><code><c- g>accumulator</c-></code></dfn>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any⑧"><c- b>any</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Reducer" data-dfn-type="argument" data-export id="dom-reducer-currentvalue"><code><c- g>currentValue</c-></code></dfn>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Reducer" data-dfn-type="argument" data-export id="dom-reducer-index"><code><c- g>index</c-></code></dfn>);
+<c- b>callback</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="callback" data-export id="callbackdef-mapper"><code><c- g>Mapper</c-></code></dfn> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any⑨"><c- b>any</c-></a> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any①⓪"><c- b>any</c-></a> <dfn class="idl-code" data-dfn-for="Mapper" data-dfn-type="argument" data-export id="dom-mapper-value"><code><c- g>value</c-></code><a class="self-link" href="#dom-mapper-value"></a></dfn>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long②"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="Mapper" data-dfn-type="argument" data-export id="dom-mapper-index"><code><c- g>index</c-></code><a class="self-link" href="#dom-mapper-index"></a></dfn>);
 // Differs from Mapper only in return type, since this callback is exclusively
 // used to visit each element in a sequence, not transform it.
-<c- b>callback</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="callback" data-export id="callbackdef-visitor"><code><c- g>Visitor</c-></code></dfn> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined⑦"><c- b>undefined</c-></a> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any①①"><c- b>any</c-></a> <dfn class="idl-code" data-dfn-for="Visitor" data-dfn-type="argument" data-export id="dom-visitor-value"><code><c- g>value</c-></code><a class="self-link" href="#dom-visitor-value"></a></dfn>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long②"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="Visitor" data-dfn-type="argument" data-export id="dom-visitor-index"><code><c- g>index</c-></code><a class="self-link" href="#dom-visitor-index"></a></dfn>);
+<c- b>callback</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="callback" data-export id="callbackdef-visitor"><code><c- g>Visitor</c-></code></dfn> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined⑦"><c- b>undefined</c-></a> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any①①"><c- b>any</c-></a> <dfn class="idl-code" data-dfn-for="Visitor" data-dfn-type="argument" data-export id="dom-visitor-value"><code><c- g>value</c-></code><a class="self-link" href="#dom-visitor-value"></a></dfn>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long③"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="Visitor" data-dfn-type="argument" data-export id="dom-visitor-index"><code><c- g>index</c-></code><a class="self-link" href="#dom-visitor-index"></a></dfn>);
 
 // This callback returns an `any` that must convert into an `Observable`, via
 // the `Observable` conversion semantics.
@@ -1181,8 +1181,8 @@ <h3 class="heading settled" data-level="2.2" id="observable-api"><span class="se
   <a data-link-type="idl-name" href="#observable" id="ref-for-observable②"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-observable-takeuntil" id="ref-for-dom-observable-takeuntil"><c- g>takeUntil</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any①⑤"><c- b>any</c-></a> <dfn class="idl-code" data-dfn-for="Observable/takeUntil(notifier)" data-dfn-type="argument" data-export id="dom-observable-takeuntil-notifier-notifier"><code><c- g>notifier</c-></code><a class="self-link" href="#dom-observable-takeuntil-notifier-notifier"></a></dfn>);
   <a data-link-type="idl-name" href="#observable" id="ref-for-observable③"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-observable-map" id="ref-for-dom-observable-map"><c- g>map</c-></a>(<a data-link-type="idl-name" href="#callbackdef-mapper" id="ref-for-callbackdef-mapper"><c- n>Mapper</c-></a> <dfn class="idl-code" data-dfn-for="Observable/map(mapper)" data-dfn-type="argument" data-export id="dom-observable-map-mapper-mapper"><code><c- g>mapper</c-></code><a class="self-link" href="#dom-observable-map-mapper-mapper"></a></dfn>);
   <a data-link-type="idl-name" href="#observable" id="ref-for-observable④"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-observable-filter" id="ref-for-dom-observable-filter"><c- g>filter</c-></a>(<a data-link-type="idl-name" href="#callbackdef-predicate" id="ref-for-callbackdef-predicate"><c- n>Predicate</c-></a> <dfn class="idl-code" data-dfn-for="Observable/filter(predicate)" data-dfn-type="argument" data-export id="dom-observable-filter-predicate-predicate"><code><c- g>predicate</c-></code><a class="self-link" href="#dom-observable-filter-predicate-predicate"></a></dfn>);
-  <a data-link-type="idl-name" href="#observable" id="ref-for-observable⑤"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-observable-take" id="ref-for-dom-observable-take"><c- g>take</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long③"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="Observable/take(amount)" data-dfn-type="argument" data-export id="dom-observable-take-amount-amount"><code><c- g>amount</c-></code><a class="self-link" href="#dom-observable-take-amount-amount"></a></dfn>);
-  <a data-link-type="idl-name" href="#observable" id="ref-for-observable⑥"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-observable-drop" id="ref-for-dom-observable-drop"><c- g>drop</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long④"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="Observable/drop(amount)" data-dfn-type="argument" data-export id="dom-observable-drop-amount-amount"><code><c- g>amount</c-></code><a class="self-link" href="#dom-observable-drop-amount-amount"></a></dfn>);
+  <a data-link-type="idl-name" href="#observable" id="ref-for-observable⑤"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-observable-take" id="ref-for-dom-observable-take"><c- g>take</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long④"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="Observable/take(amount)" data-dfn-type="argument" data-export id="dom-observable-take-amount-amount"><code><c- g>amount</c-></code><a class="self-link" href="#dom-observable-take-amount-amount"></a></dfn>);
+  <a data-link-type="idl-name" href="#observable" id="ref-for-observable⑥"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-observable-drop" id="ref-for-dom-observable-drop"><c- g>drop</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑤"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="Observable/drop(amount)" data-dfn-type="argument" data-export id="dom-observable-drop-amount-amount"><code><c- g>amount</c-></code><a class="self-link" href="#dom-observable-drop-amount-amount"></a></dfn>);
   <a data-link-type="idl-name" href="#observable" id="ref-for-observable⑦"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-observable-flatmap" id="ref-for-dom-observable-flatmap"><c- g>flatMap</c-></a>(<a data-link-type="idl-name" href="#callbackdef-mapper" id="ref-for-callbackdef-mapper①"><c- n>Mapper</c-></a> <dfn class="idl-code" data-dfn-for="Observable/flatMap(mapper)" data-dfn-type="argument" data-export id="dom-observable-flatmap-mapper-mapper"><code><c- g>mapper</c-></code><a class="self-link" href="#dom-observable-flatmap-mapper-mapper"></a></dfn>);
   <a data-link-type="idl-name" href="#observable" id="ref-for-observable⑧"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-observable-switchmap" id="ref-for-dom-observable-switchmap"><c- g>switchMap</c-></a>(<a data-link-type="idl-name" href="#callbackdef-mapper" id="ref-for-callbackdef-mapper②"><c- n>Mapper</c-></a> <dfn class="idl-code" data-dfn-for="Observable/switchMap(mapper)" data-dfn-type="argument" data-export id="dom-observable-switchmap-mapper-mapper"><code><c- g>mapper</c-></code><a class="self-link" href="#dom-observable-switchmap-mapper-mapper"></a></dfn>);
   <a data-link-type="idl-name" href="#observable" id="ref-for-observable⑨"><c- n>Observable</c-></a> <a class="idl-code" data-link-type="method" href="#dom-observable-inspect" id="ref-for-dom-observable-inspect"><c- g>inspect</c-></a>(<c- b>optional</c-> <a data-link-type="idl-name" href="#typedefdef-observableinspectorunion" id="ref-for-typedefdef-observableinspectorunion"><c- n>ObservableInspectorUnion</c-></a> <dfn class="idl-code" data-dfn-for="Observable/inspect(inspect_observer), Observable/inspect()" data-dfn-type="argument" data-export id="dom-observable-inspect-inspect_observer-inspect_observer"><code><c- g>inspect_observer</c-></code><a class="self-link" href="#dom-observable-inspect-inspect_observer-inspect_observer"></a></dfn> = {});
@@ -1453,7 +1453,7 @@ <h4 class="heading settled" data-level="2.3.2" id="observable-returning-operator
  algorithm that takes a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber①③">Subscriber</a></code> <var>subscriber</var> and does the following:</p>
       <ol>
        <li data-md>
-        <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑤">unsigned long long</a></code>, initially 0.</p>
+        <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑥">unsigned long long</a></code>, initially 0.</p>
        <li data-md>
         <p>Let <var>sourceObserver</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer⑥">internal observer</a>, initialized as follows:</p>
         <dl>
@@ -1503,7 +1503,7 @@ <h4 class="heading settled" data-level="2.3.2" id="observable-returning-operator
  algorithm that takes a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber①④">Subscriber</a></code> <var>subscriber</var> and does the following:</p>
       <ol>
        <li data-md>
-        <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑥">unsigned long long</a></code>, initially 0.</p>
+        <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑦">unsigned long long</a></code>, initially 0.</p>
        <li data-md>
         <p>Let <var>sourceObserver</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer⑦">internal observer</a>, initialized as follows:</p>
         <dl>
@@ -1648,7 +1648,7 @@ <h4 class="heading settled" data-level="2.3.2" id="observable-returning-operator
  algorithm that takes a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber①⑦">Subscriber</a></code> <var>subscriber</var> and does the following:</p>
       <ol>
        <li data-md>
-        <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑦">unsigned long long</a></code>, initially 0.</p>
+        <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑧">unsigned long long</a></code>, initially 0.</p>
        <li data-md>
         <p>Let <var>outerSubscriptionHasCompleted</var> to a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean">boolean</a>, initially false.</p>
        <li data-md>
@@ -1712,7 +1712,7 @@ <h4 class="heading settled" data-level="2.3.2" id="observable-returning-operator
     </ol>
    </div>
    <div class="algorithm" data-algorithm="flatmap process next value steps">
-     The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="flatmap-process-next-value-steps">flatmap process next value steps</dfn>, given an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any③⓪">any</a></code> <var>value</var>, a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber①⑧">Subscriber</a></code> <var>subscriber</var>, a <code class="idl"><a data-link-type="idl" href="#callbackdef-mapper" id="ref-for-callbackdef-mapper③">Mapper</a></code> <var>mapper</var>, and <b>references</b> to all of the following: a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list②">list</a> of <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any③①">any</a></code> values <var>queue</var>, a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean②">boolean</a> <var>activeInnerSubscription</var>, a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean③">boolean</a> <var>outerSubscriptionHasCompleted</var>, and an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑧">unsigned long long</a></code> <var>idx</var>: 
+     The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="flatmap-process-next-value-steps">flatmap process next value steps</dfn>, given an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any③⓪">any</a></code> <var>value</var>, a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber①⑧">Subscriber</a></code> <var>subscriber</var>, a <code class="idl"><a data-link-type="idl" href="#callbackdef-mapper" id="ref-for-callbackdef-mapper③">Mapper</a></code> <var>mapper</var>, and <b>references</b> to all of the following: a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list②">list</a> of <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any③①">any</a></code> values <var>queue</var>, a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean②">boolean</a> <var>activeInnerSubscription</var>, a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean③">boolean</a> <var>outerSubscriptionHasCompleted</var>, and an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑨">unsigned long long</a></code> <var>idx</var>: 
     <ol>
      <li data-md>
       <p>Let <var>mappedResult</var> be the result of <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#invoke-a-callback-function" id="ref-for-invoke-a-callback-function①①">invoking</a> <var>mapper</var> with <var>value</var> and <var>idx</var>.</p>
@@ -1778,7 +1778,7 @@ <h4 class="heading settled" data-level="2.3.2" id="observable-returning-operator
  algorithm that takes a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber①⑨">Subscriber</a></code> <var>subscriber</var> and does the following:</p>
       <ol>
        <li data-md>
-        <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long⑨">unsigned long long</a></code>, initially 0.</p>
+        <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①⓪">unsigned long long</a></code>, initially 0.</p>
        <li data-md>
         <p>Let <var>outerSubscriptionHasCompleted</var> be a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean④">boolean</a>, initially false.</p>
        <li data-md>
@@ -1839,7 +1839,7 @@ <h4 class="heading settled" data-level="2.3.2" id="observable-returning-operator
     </ol>
    </div>
    <div class="algorithm" data-algorithm="switchmap process next value steps">
-     The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="switchmap-process-next-value-steps">switchmap process next value steps</dfn>, given an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any③②">any</a></code> <var>value</var>, a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber②⓪">Subscriber</a></code> <var>subscriber</var>, a <code class="idl"><a data-link-type="idl" href="#callbackdef-mapper" id="ref-for-callbackdef-mapper④">Mapper</a></code> <var>mapper</var>, and <b>references</b> to all of the following: an <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller⑤">AbortController</a></code> <var>activeInnerAbortController</var>, a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean⑤">boolean</a> <var>outerSubscriptionHasCompleted</var>, and an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①⓪">unsigned long long</a></code> <var>idx</var> are to run these steps: 
+     The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="switchmap-process-next-value-steps">switchmap process next value steps</dfn>, given an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-any" id="ref-for-idl-any③②">any</a></code> <var>value</var>, a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber②⓪">Subscriber</a></code> <var>subscriber</var>, a <code class="idl"><a data-link-type="idl" href="#callbackdef-mapper" id="ref-for-callbackdef-mapper④">Mapper</a></code> <var>mapper</var>, and <b>references</b> to all of the following: an <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller⑤">AbortController</a></code> <var>activeInnerAbortController</var>, a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean⑤">boolean</a> <var>outerSubscriptionHasCompleted</var>, and an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①①">unsigned long long</a></code> <var>idx</var> are to run these steps: 
     <ol>
      <li data-md>
       <p>Let <var>mappedResult</var> be the result of <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#invoke-a-callback-function" id="ref-for-invoke-a-callback-function①②">invoking</a> <var>mapper</var> with <var>value</var> and <var>idx</var>.</p>
@@ -2150,7 +2150,7 @@ <h4 class="heading settled" data-level="2.3.3" id="promise-returning-operators">
   rejection handler runs.</p>
       </ol>
      <li data-md>
-      <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①①">unsigned long long</a></code>, initially 0.</p>
+      <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①②">unsigned long long</a></code>, initially 0.</p>
      <li data-md>
       <p>Let <var>observer</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer①⑨">internal observer</a>, initialized as follows:</p>
       <dl>
@@ -2210,7 +2210,7 @@ <h4 class="heading settled" data-level="2.3.3" id="promise-returning-operators">
   reason</a>.</p>
       </ol>
      <li data-md>
-      <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①②">unsigned long long</a></code>, initially 0.</p>
+      <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①③">unsigned long long</a></code>, initially 0.</p>
      <li data-md>
       <p>Let <var>observer</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer②⓪">internal observer</a>, initialized as follows:</p>
       <dl>
@@ -2382,7 +2382,7 @@ <h4 class="heading settled" data-level="2.3.3" id="promise-returning-operators">
   reason</a>.</p>
       </ol>
      <li data-md>
-      <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①③">unsigned long long</a></code>, initially 0.</p>
+      <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①④">unsigned long long</a></code>, initially 0.</p>
      <li data-md>
       <p>Let <var>observer</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer②③">internal observer</a>, initialized as follows:</p>
       <dl>
@@ -2439,7 +2439,7 @@ <h4 class="heading settled" data-level="2.3.3" id="promise-returning-operators">
   reason</a>.</p>
       </ol>
      <li data-md>
-      <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①④">unsigned long long</a></code>, initially 0.</p>
+      <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①⑤">unsigned long long</a></code>, initially 0.</p>
      <li data-md>
       <p>Let <var>observer</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer②④">internal observer</a>, initialized as follows:</p>
       <dl>
@@ -2472,7 +2472,67 @@ <h4 class="heading settled" data-level="2.3.3" id="promise-returning-operators">
      The <dfn class="dfn-paneled idl-code" data-dfn-for="Observable" data-dfn-type="method" data-export data-lt="reduce(reducer, initialValue, options)|reduce(reducer, initialValue)|reduce(reducer)" id="dom-observable-reduce"><code>reduce(<var>reducer</var>, <var>initialValue</var>, <var>options</var>)</code></dfn> method steps are: 
     <ol>
      <li data-md>
-      <p><span class="XXX">TODO: Spec this and use <var>reducer</var>, <var>initialValue</var>, and <var>options</var>.</span></p>
+      <p>Let <var>p</var> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#a-new-promise" id="ref-for-a-new-promise⑦">a new promise</a>.</p>
+     <li data-md>
+      <p>Let <var>controller</var> be a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#new" id="ref-for-new①⑥">new</a> <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller①②">AbortController</a></code>.</p>
+     <li data-md>
+      <p>Let <var>internal options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions②⑨">SubscribeOptions</a></code> whose <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑥④">signal</a></code> is the
+ result of <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#create-a-dependent-abort-signal" id="ref-for-create-a-dependent-abort-signal⑦">creating a dependent abort signal</a> from the list
+ «<var>controller</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal" id="ref-for-abortcontroller-signal②⑤">signal</a>, <var>options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑥⑤">signal</a></code> if non-null», using <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortsignal" id="ref-for-abortsignal⑨">AbortSignal</a></code>, and the <a data-link-type="dfn" href="https://tc39.es/ecma262/#current-realm" id="ref-for-current-realm⑥">current realm</a>.</p>
+     <li data-md>
+      <p>If <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑥⑥">signal</a></code> is <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-aborted" id="ref-for-abortsignal-aborted⑧">aborted</a>, then:</p>
+      <ol>
+       <li data-md>
+        <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject②⑥">Reject</a> <var>p</var> with <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑥⑦">signal</a></code>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason①⑦">abort reason</a>.</p>
+       <li data-md>
+        <p>Return <var>p</var>.</p>
+      </ol>
+     <li data-md>
+      <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-add" id="ref-for-abortsignal-add⑨">Add the following abort algorithm</a> to <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑥⑧">signal</a></code>:</p>
+      <ol>
+       <li data-md>
+        <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject②⑦">Reject</a> <var>p</var> with <var>internal options</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscribeoptions-signal" id="ref-for-dom-subscribeoptions-signal⑥⑨">signal</a></code>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason①⑧">abort
+  reason</a>.</p>
+      </ol>
+     <li data-md>
+      <p>Let <var>idx</var> be an <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①⑥">unsigned long long</a></code>, initially 0.</p>
+     <li data-md>
+      <p>Let <var>accumulator</var> be <var>initialValue</var> if it is given, and uninitialized otherwise.</p>
+     <li data-md>
+      <p>Let <var>observer</var> be a new <a data-link-type="dfn" href="#internal-observer" id="ref-for-internal-observer②⑤">internal observer</a>, initialized as follows:</p>
+      <dl>
+       <dt data-md><a data-link-type="dfn" href="#internal-observer-next-steps" id="ref-for-internal-observer-next-steps②⑦">next steps</a>
+       <dd data-md>
+        <ol>
+         <li data-md>
+          <p>If <var>accumulator</var> is uninitialized (meaning no <var>initialValue</var> was passed in), then set <var>accumulator</var> to the passed in <var>value</var>, set <var>idx</var> to <var>idx</var> + 1, and abort these steps.</p>
+          <p class="note" role="note"><span class="marker">Note:</span> This means that <var>reducer</var> will not be called with the first <var>value</var> that <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this③⑨">this</a> produces set as the <code class="idl"><a data-link-type="idl" href="#dom-reducer-currentvalue" id="ref-for-dom-reducer-currentvalue">currentValue</a></code>. Rather, when the <em>second</em> value is
+ eventually emitted, we will call <var>reducer</var> with <em>it</em> as the <code class="idl"><a data-link-type="idl" href="#dom-reducer-currentvalue" id="ref-for-dom-reducer-currentvalue①">currentValue</a></code>,
+ and the first value (that we’re saving here) as the <code class="idl"><a data-link-type="idl" href="#dom-reducer-accumulator" id="ref-for-dom-reducer-accumulator">accumulator</a></code>.</p>
+         <li data-md>
+          <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#invoke-a-callback-function" id="ref-for-invoke-a-callback-function②①">Invoke</a> <var>reducer</var> with <var>accumulator</var> as <code class="idl"><a data-link-type="idl" href="#dom-reducer-accumulator" id="ref-for-dom-reducer-accumulator①">accumulator</a></code>, the passed in <var>value</var> as <code class="idl"><a data-link-type="idl" href="#dom-reducer-currentvalue" id="ref-for-dom-reducer-currentvalue②">currentValue</a></code>, and <var>idx</var> as <code class="idl"><a data-link-type="idl" href="#dom-reducer-index" id="ref-for-dom-reducer-index">index</a></code>. Let <var>result</var> be
+ the returned value.</p>
+          <p>If <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#an-exception-was-thrown" id="ref-for-an-exception-was-thrown②⑤">an exception <var>E</var> was thrown</a>, then <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject②⑧">reject</a> <var>p</var> with <var>E</var>, and <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal-abort" id="ref-for-abortcontroller-signal-abort①⓪">signal abort</a> <var>controller</var> with <var>E</var>.</p>
+         <li data-md>
+          <p>Set <var>idx</var> to <var>idx</var> + 1.</p>
+         <li data-md>
+          <p>Set <var>accumulator</var> to <var>result</var>.</p>
+        </ol>
+       <dt data-md><a data-link-type="dfn" href="#internal-observer-error-steps" id="ref-for-internal-observer-error-steps②⑥">error steps</a>
+       <dd data-md>
+        <p><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject②⑨">Reject</a> <var>p</var> with the passed in <var>error</var>.</p>
+       <dt data-md><a data-link-type="dfn" href="#internal-observer-complete-steps" id="ref-for-internal-observer-complete-steps②④">complete steps</a>
+       <dd data-md>
+        <ol>
+         <li data-md>
+          <p>If <var>accumulator</var> is not "<code>unset</code>", then <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#resolve" id="ref-for-resolve①②">resolve</a> <var>p</var> with <var>accumulator</var>.</p>
+          <p>Otherwise, <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#reject" id="ref-for-reject③⓪">reject</a> <var>p</var> with a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror">TypeError</a></code>.</p>
+        </ol>
+      </dl>
+     <li data-md>
+      <p><a data-link-type="dfn" href="#observable-subscribe-to-an-observable" id="ref-for-observable-subscribe-to-an-observable②⑥">Subscribe</a> to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this④⓪">this</a> given <var>observer</var> and <var>internal options</var>.</p>
+     <li data-md>
+      <p>Return <var>p</var>.</p>
     </ol>
    </div>
    <h2 class="heading settled" data-level="3" id="event-target-integration"><span class="secno">3. </span><span class="content"><code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#eventtarget" id="ref-for-eventtarget">EventTarget</a></code> integration</span><a class="self-link" href="#event-target-integration"></a></h2>
@@ -2489,12 +2549,12 @@ <h2 class="heading settled" data-level="3" id="event-target-integration"><span c
      The <dfn class="dfn-paneled idl-code" data-dfn-for="EventTarget" data-dfn-type="method" data-export data-lt="when(type, options)|when(type)" id="dom-eventtarget-when"><code>when(<var>type</var>, <var>options</var>)</code></dfn> method steps are: 
     <ol>
      <li data-md>
-      <p>If <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this③⑨">this</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-relevant-global" id="ref-for-concept-relevant-global⑥">relevant global object</a> is a <code class="idl"><a data-link-type="idl" href="https://html.spec.whatwg.org/multipage/nav-history-apis.html#window" id="ref-for-window⑥">Window</a></code> object, and its <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/nav-history-apis.html#concept-document-window" id="ref-for-concept-document-window⑥">associated
+      <p>If <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this④①">this</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-relevant-global" id="ref-for-concept-relevant-global⑥">relevant global object</a> is a <code class="idl"><a data-link-type="idl" href="https://html.spec.whatwg.org/multipage/nav-history-apis.html#window" id="ref-for-window⑥">Window</a></code> object, and its <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/nav-history-apis.html#concept-document-window" id="ref-for-concept-document-window⑥">associated
  Document</a> is not <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/document-sequences.html#fully-active" id="ref-for-fully-active⑥">fully active</a>, then return.</p>
      <li data-md>
-      <p>Let <var>event target</var> be <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this④⓪">this</a>.</p>
+      <p>Let <var>event target</var> be <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this④②">this</a>.</p>
      <li data-md>
-      <p>Let <var>observable</var> be a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#new" id="ref-for-new①⑥">new</a> <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable④⑨">Observable</a></code>, initialized as follows:</p>
+      <p>Let <var>observable</var> be a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#new" id="ref-for-new①⑦">new</a> <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable④⑨">Observable</a></code>, initialized as follows:</p>
       <dl>
        <dt data-md><a data-link-type="dfn" href="#observable-subscribe-callback" id="ref-for-observable-subscribe-callback①④">subscribe callback</a>
        <dd data-md>
@@ -2505,7 +2565,7 @@ <h2 class="heading settled" data-level="3" id="event-target-integration"><span c
           <p class="note" role="note"><span class="marker">Note:</span> This is meant to capture the fact that <var>event target</var> can be garbage collected
  by the time this algorithm runs upon subscription.</p>
          <li data-md>
-          <p>If <var>subscriber</var>’s <a data-link-type="dfn" href="#subscriber-subscription-controller" id="ref-for-subscriber-subscription-controller②⓪">subscription controller</a>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal" id="ref-for-abortcontroller-signal②⑤">signal</a> is <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-aborted" id="ref-for-abortsignal-aborted⑧">aborted</a>, abort these steps.</p>
+          <p>If <var>subscriber</var>’s <a data-link-type="dfn" href="#subscriber-subscription-controller" id="ref-for-subscriber-subscription-controller②⓪">subscription controller</a>'s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortcontroller-signal" id="ref-for-abortcontroller-signal②⑥">signal</a> is <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-aborted" id="ref-for-abortsignal-aborted⑨">aborted</a>, abort these steps.</p>
          <li data-md>
           <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#add-an-event-listener" id="ref-for-add-an-event-listener">Add an event listener</a> with <var>event target</var> and an <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-listener" id="ref-for-concept-event-listener">event listener</a> defined as follows:</p>
           <dl>
@@ -2529,7 +2589,7 @@ <h2 class="heading settled" data-level="3" id="event-target-integration"><span c
            <dt data-md><a data-link-type="dfn" href="https://dom.spec.whatwg.org#event-listener-signal" id="ref-for-event-listener-signal">signal</a>
            <dd data-md>
             <p>null</p>
-            <p class="note" role="note"><span class="marker">Note:</span> The <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortsignal" id="ref-for-abortsignal⑨">AbortSignal</a></code> for event listeners <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#add-an-event-listener" id="ref-for-add-an-event-listener①">added</a> by <code class="idl"><a data-link-type="idl" href="#dom-eventtarget-when" id="ref-for-dom-eventtarget-when②">when()</a></code> is managed by the <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable⑤⓪">Observable</a></code> itself. See <code class="idl"><a data-link-type="idl" href="#dom-observable-subscribe" id="ref-for-dom-observable-subscribe⑤">subscribe()</a></code> and <code class="idl"><a data-link-type="idl" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions②⑨">SubscribeOptions</a></code>.</p>
+            <p class="note" role="note"><span class="marker">Note:</span> The <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortsignal" id="ref-for-abortsignal①⓪">AbortSignal</a></code> for event listeners <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#add-an-event-listener" id="ref-for-add-an-event-listener①">added</a> by <code class="idl"><a data-link-type="idl" href="#dom-eventtarget-when" id="ref-for-dom-eventtarget-when②">when()</a></code> is managed by the <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable⑤⓪">Observable</a></code> itself. See <code class="idl"><a data-link-type="idl" href="#dom-observable-subscribe" id="ref-for-dom-observable-subscribe⑤">subscribe()</a></code> and <code class="idl"><a data-link-type="idl" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions③⓪">SubscribeOptions</a></code>.</p>
           </dl>
         </ol>
       </dl>
@@ -2742,6 +2802,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
     <ul>
      <li><span class="dfn-paneled" id="8855a9aa">DOMString</span>
      <li><span class="dfn-paneled" id="bdbd19d1">Promise</span>
+     <li><span class="dfn-paneled" id="82ca3efc">TypeError</span>
      <li><span class="dfn-paneled" id="7004c2a7">VoidFunction</span>
      <li><span class="dfn-paneled" id="dacde8b5">a new promise</span>
      <li><span class="dfn-paneled" id="cc61f510">an exception was thrown</span>
@@ -2818,7 +2879,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
 };
 
 <c- b>callback</c-> <a href="#callbackdef-predicate"><code><c- g>Predicate</c-></code></a> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any"><c- b>any</c-></a> <a href="#dom-predicate-value"><code><c- g>value</c-></code></a>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <a href="#dom-predicate-index"><code><c- g>index</c-></code></a>);
-<c- b>callback</c-> <a href="#callbackdef-reducer"><code><c- g>Reducer</c-></code></a> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any"><c- b>any</c-></a> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any"><c- b>any</c-></a> <a href="#dom-reducer-accumulator"><code><c- g>accumulator</c-></code></a>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any"><c- b>any</c-></a> <a href="#dom-reducer-currentvalue"><code><c- g>currentValue</c-></code></a>);
+<c- b>callback</c-> <a href="#callbackdef-reducer"><code><c- g>Reducer</c-></code></a> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any"><c- b>any</c-></a> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any"><c- b>any</c-></a> <a href="#dom-reducer-accumulator"><code><c- g>accumulator</c-></code></a>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any"><c- b>any</c-></a> <a href="#dom-reducer-currentvalue"><code><c- g>currentValue</c-></code></a>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <a href="#dom-reducer-index"><code><c- g>index</c-></code></a>);
 <c- b>callback</c-> <a href="#callbackdef-mapper"><code><c- g>Mapper</c-></code></a> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any"><c- b>any</c-></a> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-any"><c- b>any</c-></a> <a href="#dom-mapper-value"><code><c- g>value</c-></code></a>, <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <a href="#dom-mapper-index"><code><c- g>index</c-></code></a>);
 // Differs from Mapper only in return type, since this callback is exclusively
 // used to visit each element in a sequence, not transform it.
@@ -3196,30 +3257,30 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
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