diff --git a/index.html b/index.html
index a6702e5..4a82b2d 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="abd795bba70dff30d8e4e795b9d9295df08d9465" name="document-revision">
+  <meta content="5ef367b3a03a02fe835bb2970d23b8aba10965fc" name="document-revision">
 <style>
 /* Put nice boxes around each algorithm. */
 [data-algorithm]:not(.heading) {
@@ -1631,6 +1631,8 @@ <h4 class="heading settled" data-level="2.3.2" id="observable-returning-operator
       <p>Let <var>observable</var> be a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#new" id="ref-for-new⑥">new</a> <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable②⑦">Observable</a></code> whose <a data-link-type="dfn" href="#observable-subscribe-callback" id="ref-for-observable-subscribe-callback①⓪">subscribe callback</a> is an
  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-long⑦">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>
@@ -1659,7 +1661,7 @@ <h4 class="heading settled" data-level="2.3.2" id="observable-returning-operator
              <li data-md>
               <p>Set <var>activeInnerSubscription</var> to true.</p>
              <li data-md>
-              <p>Run the <a data-link-type="dfn" href="#flatmap-process-next-value-steps" id="ref-for-flatmap-process-next-value-steps">flatmap process next value steps</a> with <var>value</var>, <var>subscriber</var>, <var>mapper</var>, and <b>references</b> to all of the following: <var>queue</var>, <var>activeInnerSubscription</var>, and <var>outerSubscriptionHasCompleted</var>.</p>
+              <p>Run the <a data-link-type="dfn" href="#flatmap-process-next-value-steps" id="ref-for-flatmap-process-next-value-steps">flatmap process next value steps</a> with <var>value</var>, <var>subscriber</var>, <var>mapper</var>, and <b>references</b> to all of the following: <var>queue</var>, <var>activeInnerSubscription</var>, <var>outerSubscriptionHasCompleted</var>, and <var>idx</var>.</p>
               <div class="note" role="note">
                <p>Note: This <a data-link-type="dfn" href="#flatmap-process-next-value-steps" id="ref-for-flatmap-process-next-value-steps①">flatmap process next value steps</a> will subscribe to the <code class="idl"><a data-link-type="idl" href="#observable" id="ref-for-observable③①">Observable</a></code> derived from <var>value</var> (if one such can be derived) and keep
    processing values from it until its subscription becomes inactive (either by
@@ -1694,11 +1696,13 @@ <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-any②④">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-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-any②⑤">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>, and a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean③">boolean</a> <var>outerSubscriptionHasCompleted</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-any②④">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-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-any②⑤">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>: 
     <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>.</p>
+      <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>
       <p>If <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#an-exception-was-thrown" id="ref-for-an-exception-was-thrown①②">an exception <var>E</var> was thrown</a>, then run <var>subscriber</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscriber-error" id="ref-for-dom-subscriber-error①②">error()</a></code> method, given <var>E</var>, and abort these steps.</p>
+     <li data-md>
+      <p>Set <var>idx</var> to <var>idx</var> + 1.</p>
      <li data-md>
       <p>Let <var>innerObservable</var> be the result of calling <code class="idl"><a data-link-type="idl" href="#dom-observable-from" id="ref-for-dom-observable-from②">from()</a></code> with <var>mappedResult</var>.</p>
       <p>If <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#an-exception-was-thrown" id="ref-for-an-exception-was-thrown①③">an exception <var>E</var> was thrown</a>, then run <var>subscriber</var>’s <code class="idl"><a data-link-type="idl" href="#dom-subscriber-error" id="ref-for-dom-subscriber-error①③">error()</a></code> method, given <var>E</var>, and abort these steps.</p>
@@ -1758,7 +1762,7 @@ <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-subscriber②①">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-long⑨">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>
@@ -1819,7 +1823,7 @@ <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-any②⑥">any</a></code> <var>value</var>, a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber②②">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-long⑧">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-any②⑥">any</a></code> <var>value</var>, a <code class="idl"><a data-link-type="idl" href="#subscriber" id="ref-for-subscriber②②">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: 
     <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>
@@ -1962,7 +1966,7 @@ <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-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-long①①">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-observer①⑥">internal observer</a>, initialized as follows:</p>
       <dl>
@@ -2022,7 +2026,7 @@ <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-long①⓪">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-observer①⑦">internal observer</a>, initialized as follows:</p>
       <dl>
@@ -2078,7 +2082,7 @@ <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-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-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-observer①⑧">internal observer</a>, initialized as follows:</p>
       <dl>
@@ -2135,7 +2139,7 @@ <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-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-observer①⑨">internal observer</a>, initialized as follows:</p>
       <dl>
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