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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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>[DOCS-12504] Warn that documents with duplicate key names are not supported</title>
                <link>https://jira.mongodb.org/browse/DOCS-12504</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;Low level BSON helpers in some drivers (for example, the BSON writer in the Java driver) can be abused to create documents with duplicate key names. For example:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;The &lt;a href=&quot;http://bsonspec.org/spec.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;BSON spec&lt;/a&gt; is silent on the issue of duplicate key names. The server&apos;s behavior when confronted with duplicate key names &lt;a href=&quot;https://jira.mongodb.org/browse/HELP-8718?focusedCommentId=2158833&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-2158833&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;is undefined&lt;/a&gt;. Since drivers generally use a map to represent a BSON document, only one of the keys will survive decoding and reinsertion of such a document.&lt;/p&gt;

&lt;p&gt;A good place to add this might be &lt;a href=&quot;https://docs.mongodb.com/manual/reference/limits/#Restrictions-on-Field-Names&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/limits/#Restrictions-on-Field-Names&lt;/a&gt; but the text should really be a warning / call to action.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="702563">DOCS-12504</key>
            <summary>Warn that documents with duplicate key names are not supported</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="nathan.contino@mongodb.com">Nathan Contino</assignee>
                                    <reporter username="bernie@mongodb.com">Bernie Hackett</reporter>
                        <labels>
                            <label>docs-onboarding-candidate</label>
                    </labels>
                <created>Fri, 22 Feb 2019 00:40:46 +0000</created>
                <updated>Mon, 30 Oct 2023 20:45:25 +0000</updated>
                            <resolved>Tue, 10 Sep 2019 18:30:00 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2414995" author="xgen-internal-githook" created="Tue, 10 Sep 2019 18:13:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;nathan-contino-mongo&apos;, &apos;username&apos;: &apos;nathan-contino-mongo&apos;, &apos;email&apos;: &apos;nathan.contino@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12504&quot; title=&quot;Warn that documents with duplicate key names are not supported&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12504&quot;&gt;&lt;del&gt;DOCS-12504&lt;/del&gt;&lt;/a&gt;: duplicate key name warning&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/6298d4de42767a43507d12030fb448d8dc6dd3ae&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/6298d4de42767a43507d12030fb448d8dc6dd3ae&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="702546">DRIVERS-612</issuekey>
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