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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-36429] $toUpper / $toLower should support locale-aware case mappings</title>
                <link>https://jira.mongodb.org/browse/SERVER-36429</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;$toUpper / $toLower currently only have defined behavior for ASCII characters. Users should be able to perform case folding / case mapping for all Unicode code points, according to locale-specific rules. It looks like ICU has support for this:&#160;&lt;a href=&quot;http://userguide.icu-project.org/transforms/casemappings&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://userguide.icu-project.org/transforms/casemappings&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="581780">SERVER-36429</key>
            <summary>$toUpper / $toLower should support locale-aware case mappings</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="dev.ashevchuk@gmail.com">Andrew Shevchuk</reporter>
                        <labels>
                    </labels>
                <created>Fri, 3 Aug 2018 12:18:10 +0000</created>
                <updated>Tue, 6 Dec 2022 03:22:23 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1964924" author="ashevchuk" created="Fri, 3 Aug 2018 14:26:07 +0000"  >&lt;p&gt;Yes, locale-aware case folding would be nice.&lt;br/&gt;
Thanks.&lt;/p&gt;</comment>
                            <comment id="1964889" author="david.storch" created="Fri, 3 Aug 2018 14:08:03 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ashevchuk&quot; class=&quot;user-hover&quot; rel=&quot;ashevchuk&quot;&gt;ashevchuk&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for filing this report! A collation is nothing more than a comparator between two strings. Therefore, a collation does not specify case mapping rules. Our documentation specifies that &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/toUpper/#behavior&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$toUpper only has well-defined behavior for ASCII characters&lt;/a&gt; (and &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/toLower/#behavior&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;same for $toLower&lt;/a&gt;). This is working as designed.&lt;/p&gt;

&lt;p&gt;I am going to convert this into a feature request to permit locale-aware case folding in the MongoDB aggregation framework.&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
 Dave&lt;/p&gt;</comment>
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