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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-78800] Umlauts are not converted to lower or upper case letters</title>
                <link>https://jira.mongodb.org/browse/SERVER-78800</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Umlauts (&#228;&#196;,&#246;&#214;,&#252;&#220;) are not converted to their lower or upper case with the aggregation pipeline operations `$toLower` or `$toUpper`.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2387181">SERVER-78800</key>
            <summary>Umlauts are not converted to lower or upper case letters</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13202">Works as Designed</resolution>
                                        <assignee username="yuan.fang@mongodb.com">Yuan Fang</assignee>
                                    <reporter username="felix.pries@icloud.com">Felix Pries</reporter>
                        <labels>
                            <label>Bug</label>
                    </labels>
                <created>Mon, 10 Jul 2023 08:49:40 +0000</created>
                <updated>Fri, 27 Oct 2023 13:51:32 +0000</updated>
                            <resolved>Mon, 10 Jul 2023 19:30:52 +0000</resolved>
                                    <version>6.0.5</version>
                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5555575" author="JIRAUSER1270794" created="Mon, 10 Jul 2023 19:30:08 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=felix.pries%40icloud.com&quot; class=&quot;user-hover&quot; rel=&quot;felix.pries@icloud.com&quot;&gt;felix.pries@icloud.com&lt;/a&gt;,&#160;&lt;/p&gt;

&lt;p&gt;Thank you for your report. I understand that&#160; &lt;tt&gt;$toLower&lt;/tt&gt; and &lt;tt&gt;$toUpper&lt;/tt&gt; are not working with &#228;&#252;&#246;(and upper-case umlauts). This is expected behavior because MongoDB aggregation pipeline operator &lt;tt&gt;$toUpper&lt;/tt&gt; &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/operator/aggregation/toUpper/#behavior&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;only has a well-defined behavior for strings of ASCII characters&lt;/a&gt;, and the same applies to &lt;tt&gt;$toLower&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;I can see how this behavior would be valuable for supporting non-ASCII characters. However, this JIRA project is for bug reports, but you can help get this on the radar by submitting a feature request to our &lt;a href=&quot;https://feedback.mongodb.com/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB Feedback Engine&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;You may also want to search and post on the &lt;a href=&quot;https://community.mongodb.com/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB Developer Community Forums&lt;/a&gt;, as it&apos;s possible there are others who have guidance on how to satisfy your use case.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Yuan&lt;/p&gt;</comment>
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	&lt;li&gt;Create a new document in which a field contains umlauts.&lt;br/&gt;
Example: `{&quot;a&quot;: &quot;&#228;&#196;&#246;&#214;&#252;&#220;&quot;}`&lt;/li&gt;
	&lt;li&gt;Create a new aggregation pipeline&lt;/li&gt;
	&lt;li&gt;Add a project stage that contains the operation `$toLower` and/or `$toUpper`.&lt;br/&gt;
Example: `{$project: {&quot;upper&quot;: {$toUpper: &quot;$a&quot;}, &quot;lower&quot;: {$toLower: &quot;$a&quot;}}`&lt;/li&gt;
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