Avoid mutating newImportMap

source

@@ -108854,8 +108854,15 @@ dictionary <dfn dictionary>PromiseRejectionEventInit</dfn> : <span>EventInit</sp
 
     <p class="note">We're mutating this copy and removing items from it when they are used to
     ignore scope-specific rules. That enables keeping less-specific rules that would match the same
-    specifier.</p>
-    </li>
+    specifier. The same is true for <var>newImportMapScopes</var> and <var>newImportMapImports</var>
+    below.</p>
+   </li>
+
+   <li><p>Let <var>newImportMapScopes</var> be a deep copy of <var>newImportMap</var>'s <span
+   data-x="concept-import-map-scopes">scopes</span>.</p></li>
+
+   <li><p>Let <var>newImportMapImports</var> be a deep copy of <var>newImportMap</var>'s <span
+   data-x="concept-import-map-imports">imports</span>.</p></li>
 
    <li><p><span data-x="set iterate">For each</span> <var>pair</var> of
    <var>resolvedSetCopy</var>:</p>
@@ -108875,8 +108882,6 @@ dictionary <dfn dictionary>PromiseRejectionEventInit</dfn> : <span>EventInit</sp
        concatenate">concatenating</span> <var>tokens</var> on on U+002F ("<code
        data-x="">/</code>").</p></li>
 
-       <li><p>Let <var>newImportMapScopes</var> be <var>newImportMap</var>'s <span
-       data-x="concept-import-map-scopes">scopes</span>.</p></li>
        <li>
         <p>If <var>current path</var> <span data-x="map exists">exists</span> in
         <var>newImportMapScopes</var>, then:</p>
@@ -108900,8 +108905,7 @@ dictionary <dfn dictionary>PromiseRejectionEventInit</dfn> : <span>EventInit</sp
     </ol>
    </li>
    <li><p><span data-x="map iterate">For each</span> <var>scopePrefix</var> →
-    <var>scopeImports</var> of <var>newImportMap</var>'s <span
-    data-x="concept-import-map-scopes">scopes</span>:</p>
+    <var>scopeImports</var> of <var>newImportMapScopes</var>:</p>
     <ol>
      <li><p>If <var>scopePrefix</var> <span data-x="map exists">exists</span> in
      <var>oldImportMap</var>'s <span data-x="concept-import-map-scopes">scopes</span>, then
@@ -108933,13 +108937,12 @@ dictionary <dfn dictionary>PromiseRejectionEventInit</dfn> : <span>EventInit</sp
    </li>
 
    <li><p><span data-x="list iterate">For each</span> <var>pair</var> of
-   <var>resolvedSetCopy</var>, remove <var>newImportMap</var>'s <span
-   data-x="concept-import-map-imports">imports</span>[<var>specifier</var>].</p></li>
+   <var>resolvedSetCopy</var>, remove <var>newImportMapImports</var>[<var>specifier</var>].</p></li>
 
    <li><p>Set <var>oldImportMap</var>'s <span data-x="concept-import-map-imports">imports</span> to
    the result of <span data-x="merge module specifier maps">merge module specifier maps</span>,
-   given <var>newImportMap</var>'s <span data-x="concept-import-map-imports">imports</span> and
-   <var>oldImportMap</var>'s <span data-x="concept-import-map-imports">imports</span>.</p></li>
+   given <var>newImportMapImports</var> and <var>oldImportMap</var>'s <span
+   data-x="concept-import-map-imports">imports</span>.</p></li>
   </ol>
 
   <p class="note">The above algorithm merges a new import map into the given <span>environment