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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-5282] duplicate key results</title>
                <link>https://jira.mongodb.org/browse/SERVER-5282</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Using the cxx driver I managed to create an object containing the following fields:&lt;/p&gt;
{ _id: ObjId(4f59f734a695f63cb649e03b), a: 1, a: 2, a: 3, a: 4 }

&lt;p&gt;In most drivers (PHP, PyMongo, Java, node.js) the result of retrieving the object is predictably:&lt;/p&gt;
{ _id: ObjId(4f59f734a695f63cb649e03b), a: 4 }

&lt;p&gt;However in the shell I get:&lt;/p&gt;

&lt;p&gt;&amp;gt; db.persons.find().forEach(printjson)&lt;br/&gt;
{&lt;br/&gt;
        &quot;_id&quot; : ObjectId(&quot;4f59f734a695f63cb649e03b&quot;),&lt;br/&gt;
        &quot;a&quot; : 1,&lt;br/&gt;
        &quot;a&quot; : 1,&lt;br/&gt;
        &quot;a&quot; : 1,&lt;br/&gt;
        &quot;a&quot; : 1&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;What I&apos;m curious about is why the shell uses the first value of &quot;a&quot; instead of the last one.&lt;/p&gt;</description>
                <environment></environment>
        <key id="32683">SERVER-5282</key>
            <summary>duplicate key results</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-platform">DO NOT USE - Backlog - Platform Team</assignee>
                                    <reporter username="kai5263499">Wes Widner</reporter>
                        <labels>
                    </labels>
                <created>Sun, 11 Mar 2012 00:05:07 +0000</created>
                <updated>Mon, 25 Oct 2021 12:49:36 +0000</updated>
                            <resolved>Mon, 25 Oct 2021 12:49:36 +0000</resolved>
                                                    <fixVersion>features we&amp;#39;re not sure of</fixVersion>
                                    <component>JavaScript</component>
                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="97565" author="eliot" created="Sun, 11 Mar 2012 06:18:38 +0000"  >&lt;p&gt;The behavior in this case is undefined from javascript.&lt;br/&gt;
Not sure what the &lt;em&gt;right&lt;/em&gt; behavior is.&lt;/p&gt;</comment>
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