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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-16525] Block field names with dollar sign prefix at insert time</title>
                <link>https://jira.mongodb.org/browse/SERVER-16525</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As reported in &lt;a href=&quot;https://jira.mongodb.org/browse/CXX-443&quot; title=&quot;Could not update an object with &amp;quot;$something&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CXX-443&quot;&gt;&lt;del&gt;CXX-443&lt;/del&gt;&lt;/a&gt;, with MongoDB 2.6 and the right driver (in this case the 26compat C++ driver) it is possible to insert a document that contains a field prefixed with a dollar sign, whereas for a corresponding update the server returns an error:&lt;/p&gt;

&lt;p&gt;&quot;The dollar ($) prefixed field &apos;$unwind&apos; in &apos;pipeline.0.$unwind&apos; is not valid for storage.&quot;&lt;/p&gt;

&lt;p&gt;This seems inconsistent and unintuitive.  The server should prevent dollar sign prefixed fields (and more generally, fields containing any reserved characters) from entering the system.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="174218">SERVER-16525</key>
            <summary>Block field names with dollar sign prefix at insert time</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jon.rangel@mongodb.com">Jon Rangel</reporter>
                        <labels>
                    </labels>
                <created>Fri, 12 Dec 2014 12:36:58 +0000</created>
                <updated>Sun, 14 Dec 2014 05:04:47 +0000</updated>
                            <resolved>Fri, 12 Dec 2014 12:45:26 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
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                            <comment id="784708" author="scotthernandez" created="Fri, 12 Dec 2014 12:45:26 +0000"  >&lt;p&gt;Dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10987&quot; title=&quot;Disallow inserting documents with invalid field names (nested)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10987&quot;&gt;SERVER-10987&lt;/a&gt;&lt;/p&gt;</comment>
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