Editorial: Incorporate ECMA-262 "lexicographic code unit order"

No need for the extra AO SortStringListByCodeUnit. ECMA-262 editors decided to go with the wording "sorted according to lexicographic code unit order". The change to AvailableNamedTimeZoneIdentifiers has now been made directly in ECMA-262, so no need to carry that diff in the Temporal spec anymore. See tc39/ecma262#3299.
tc39 · May 2, 2024 · 4e96961 · 4e96961
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Showing 4 changed files with 3 additions and 63 deletions.
diff --git a/spec/abstractops.html b/spec/abstractops.html
@@ -1991,7 +1991,7 @@ <h1>
           1. Append _desc_.[[Property]] to _fieldNames_.
           1. If _desc_.[[Required]] is *true* and _requiredFields_ is a List, then
             1. Append _desc_.[[Property]] to _requiredFields_.
-      1. Let _sortedFieldNames_ be SortStringListByCodeUnit(_fieldNames_).
+      1. Let _sortedFieldNames_ be a List whose elements are the elements of _fieldNames_, sorted according to lexicographic code unit order.
       1. Let _previousProperty_ be *undefined*.
       1. For each property name _property_ of _sortedFieldNames_, do
         1. If _property_ is one of *"constructor"* or *"__proto__"*, then

diff --git a/spec/calendar.html b/spec/calendar.html
@@ -49,11 +49,10 @@ <h1>
         <dd>Each element in the returned List represents a calendar type supported by the implementation.</dd>
       </dl>
       <emu-alg>
-        1. Let _calendars_ be the List of String values representing calendar types supported by the implementation.
+        1. Let _calendars_ be the List of String values representing calendar types supported by the implementation, sorted according to lexicographic code unit order.
         1. Assert: _calendars_ contains *"iso8601"*.
         1. [declared="S"] Assert: _calendars_ does not contain any element _S_ for which the ASCII-lowercase of _S_ is not _S_.
         1. Assert: _calendars_ does not contain any element that does not identify a calendar type in the <a href="https://cldr.unicode.org/">Unicode Common Locale Data Repository (CLDR)</a>.
-        1. Return SortStringListByCodeUnit(_calendars_).
       </emu-alg>
     </emu-clause>
   </emu-clause>

diff --git a/spec/intl.html b/spec/intl.html
@@ -113,10 +113,9 @@ <h1>AvailableNamedTimeZoneIdentifiers ( ): a List of Time Zone Identifier Record
         </dl>
         <p>This definition supersedes the definition provided in <emu-xref href="#sec-availablenamedtimezoneidentifiers"></emu-xref>.</p>
         <emu-alg>
-          1. Let _identifiers_ be a List containing the String value of each Zone or Link name in the IANA Time Zone Database.
+          1. Let _identifiers_ be a List containing the String value of each Zone or Link name in the IANA Time Zone Database, sorted according to lexicographic code unit order.
           1. Assert: No element of _identifiers_ is an ASCII-case-insensitive match for any other element.
           1. Assert: Every element of _identifiers_ identifies a Zone or Link name in the IANA Time Zone Database.
-          1. Set _identifiers_ to SortStringListByCodeUnit(_identifiers_).
           1. Let _result_ be a new empty List.
           1. For each element _identifier_ of _identifiers_, do
             1. Let _primary_ be _identifier_.

diff --git a/spec/mainadditions.html b/spec/mainadditions.html
@@ -66,25 +66,6 @@ <h1>The Year-Week Record Specification Type</h1>
     </emu-clause>
   </ins>
 
-  <ins class="block">
-    <emu-clause id="sec-sortstringlistbycodeunit" type="abstract operation">
-      <h1>
-        SortStringListByCodeUnit (
-          _strings_: a List of Strings,
-        ): a List of Strings
-      </h1>
-      <dl class="header">
-        <dt>description</dt>
-        <dd>The returned List contains the same Strings as _strings_, but sorted lexicographically by UTF-16 code unit in ascending order.</dd>
-      </dl>
-      <emu-alg>
-        1. Let _result_ be a copy of _strings_.
-        1. [declared="comparefn"] Sort _result_ into the same order as if an Array of the same values had been sorted using %Array.prototype.sort% with *undefined* as _comparefn_.
-        1. Return _result_.
-      </emu-alg>
-    </emu-clause>
-  </ins>
-
   <emu-clause id="sec-mathematical-operations">
     <h1>Mathematical Operations</h1>
     <p>[...]</p>
@@ -233,45 +214,6 @@ <h1>Time Zone Identifiers</h1>
       </p>
     </emu-clause>
 
-    <emu-clause id="sec-availablenamedtimezoneidentifiers" type="implementation-defined abstract operation">
-      <h1>AvailableNamedTimeZoneIdentifiers ( ): a List of Time Zone Identifier Records</h1>
-      <dl class="header">
-        <dt>description</dt>
-        <dd>
-          Its result describes all available named time zone identifiers in this implementation, as well as the primary time zone identifier corresponding to each available named time zone identifier.
-          The List is ordered according to the [[Identifier]] field of each Time Zone Identifier Record.
-        </dd>
-      </dl>
-      <p>
-        Time zone aware implementations, including all implementations that implement the ECMA-402 Internationalization API, must implement the AvailableNamedTimeZoneIdentifiers abstract operation as specified in the ECMA-402 specification.
-        For implementations that are not time zone aware, AvailableNamedTimeZoneIdentifiers performs the following steps when called:
-      </p>
-      <emu-alg>
-        1. If the implementation does not include local political rules for any time zones, then
-          1. Return « the Time Zone Identifier Record { [[Identifier]]: *"UTC"*, [[PrimaryIdentifier]]: *"UTC"* } ».
-        1. Let _identifiers_ be the List of unique available named time zone identifiers.
-        1. <del>Sort _identifiers_ into the same order as if an Array of the same values had been sorted using %Array.prototype.sort% with *undefined* as the argument.</del>
-        1. <ins>Set _identifiers_ to SortStringListByCodeUnit(_identifiers_).</ins>
-        1. Let _result_ be a new empty List.
-        1. For each element _identifier_ of _identifiers_, do
-          1. Let _primary_ be _identifier_.
-          1. If _identifier_ is a non-primary time zone identifier in this implementation and _identifier_ is not *"UTC"*, then
-            1. Set _primary_ to the primary time zone identifier associated with _identifier_.
-            1. NOTE: An implementation may need to resolve _identifier_ iteratively to obtain the primary time zone identifier.
-          1. Let _record_ be the Time Zone Identifier Record { [[Identifier]]: _identifier_, [[PrimaryIdentifier]]: _primary_ }.
-          1. Append _record_ to _result_.
-        1. Assert: _result_ contains a Time Zone Identifier Record _r_ such that _r_.[[Identifier]] is *"UTC"* and _r_.[[PrimaryIdentifier]] is *"UTC"*.
-        1. Return _result_.
-      </emu-alg>
-
-      <emu-note>
-        Time zone identifiers in the IANA Time Zone Database can change over time.
-        At a minimum, implementations must limit changes to the result of AvailableNamedTimeZoneIdentifiers to the changes allowed by GetAvailableNamedTimeZoneIdentifier, for the lifetime of the surrounding agent.
-        That is, implementations must not remove support for or change the primary vs. non-primary status of an identifier that was already reported as available, and they must not add support for an identifier that was already reported as not available.
-        Due to the complexity of supporting these recommendations, it is recommended that the result of AvailableNamedTimeZoneIdentifiers remains the same for the lifetime of the surrounding agent.
-      </emu-note>
-    </emu-clause>
-
     <emu-clause id="sec-systemtimezoneidentifier" oldids="sec-defaulttimezone" type="implementation-defined abstract operation">
       <h1>SystemTimeZoneIdentifier ( ): a String</h1>
       <dl class="header">