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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>[SERVER-9066] Field names can be repeated in JavaScript when the same value is set multiple times</title>
                <link>https://jira.mongodb.org/browse/SERVER-9066</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8624&quot; title=&quot;Remove read-only constraint on Reduce function values&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8624&quot;&gt;&lt;del&gt;SERVER-8624&lt;/del&gt;&lt;/a&gt;, we switched to a mutable argument flag for invoke().  The goal was to make it possible to utilize the function argument directly instead of having to perform a deep copy.&lt;/p&gt;

&lt;p&gt;When manipulating one of these arguments, some properties added to the argument appear in the result set with duplicate field names (when running with jsMode:false).&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_thread/thread/8dc58c951e26a085&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_thread/thread/8dc58c951e26a085&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="69328">SERVER-9066</key>
            <summary>Field names can be repeated in JavaScript when the same value is set multiple times</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="9">Done</resolution>
                                        <assignee username="benjamin.becker">Ben Becker</assignee>
                                    <reporter username="benjamin.becker">Ben Becker</reporter>
                        <labels>
                            <label>javascript</label>
                            <label>mapreduce</label>
                    </labels>
                <created>Thu, 21 Mar 2013 21:00:30 +0000</created>
                <updated>Mon, 11 Jul 2016 17:56:23 +0000</updated>
                            <resolved>Mon, 1 Apr 2013 19:23:23 +0000</resolved>
                                    <version>2.4.0</version>
                                    <fixVersion>2.4.2</fixVersion>
                    <fixVersion>2.5.0</fixVersion>
                                    <component>JavaScript</component>
                    <component>MapReduce</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="303616" author="auto" created="Mon, 1 Apr 2013 21:44:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-04-01T19:21:53Z&apos;, u&apos;name&apos;: u&apos;Ben Becker&apos;, u&apos;email&apos;: u&apos;ben.becker@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9066&quot; title=&quot;Field names can be repeated in JavaScript when the same value is set multiple times&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9066&quot;&gt;&lt;del&gt;SERVER-9066&lt;/del&gt;&lt;/a&gt;: avoid duplicate JS field names&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f1017ee04454faace5997a3604527d3fd6bccda9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f1017ee04454faace5997a3604527d3fd6bccda9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="303506" author="auto" created="Mon, 1 Apr 2013 19:22:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-04-01T19:21:53Z&apos;, u&apos;name&apos;: u&apos;Ben Becker&apos;, u&apos;email&apos;: u&apos;ben.becker@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9066&quot; title=&quot;Field names can be repeated in JavaScript when the same value is set multiple times&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9066&quot;&gt;&lt;del&gt;SERVER-9066&lt;/del&gt;&lt;/a&gt;: avoid duplicate JS field names&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d2febea6d4a66998682467aa0e4adc0d55365166&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d2febea6d4a66998682467aa0e4adc0d55365166&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="302089" author="benjamin.becker" created="Sat, 30 Mar 2013 04:48:59 +0000"  >&lt;p&gt;Issue was that BSONHolder::_extra was an stl list, so there was nothing preventing duplicate entries.  This happens when, for example, the same property is set multiple times on an object.  The resulting BSON then contains repeated elements.&lt;/p&gt;
</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="72884">SERVER-9442</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="71837">SERVER-9353</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="65788">SERVER-8624</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="25263" name="mr_jsonly_test.js" size="1682" author="benjamin.becker" created="Thu, 21 Mar 2013 21:00:30 +0000"/>
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