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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-29912] $pop update modifier should validate that its argument is either 1 or -1</title>
                <link>https://jira.mongodb.org/browse/SERVER-29912</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 3.6.x versions, the argument to the &lt;tt&gt;$pop&lt;/tt&gt; mode will be validated more strictly once the featureCompatibilityVersion is set to &quot;3.6&quot;.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;Oldbehavior&quot;&gt;&lt;/a&gt;Old behavior&lt;/h3&gt;

&lt;p&gt;The past behavior was that &lt;em&gt;any&lt;/em&gt; BSON element was allowed in place of &lt;tt&gt;elt&lt;/tt&gt; below:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.collection.update({}, {$pop: {&quot;array&quot;: &amp;lt;elt&amp;gt;}});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;p/&gt;

&lt;p&gt;If &amp;lt;elt&amp;gt; was numeric and less than zero, then the &lt;tt&gt;$pop&lt;/tt&gt; would remove the &lt;em&gt;first&lt;/em&gt; element of the array. On the other hand, if &amp;lt;elt&amp;gt; was any non-numeric type or was a number greater than or equal to zero, &lt;tt&gt;$pop&lt;/tt&gt; would remove the &lt;em&gt;last&lt;/em&gt; element of the array.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;Newbehavior&quot;&gt;&lt;/a&gt;New behavior&lt;/h3&gt;

&lt;p&gt;&lt;tt&gt;$pop&lt;/tt&gt; will now fail at parse time if &lt;tt&gt;elt&lt;/tt&gt; is either a non-numeric type, or is a number which is not equal to 1 or -1. All numeric BSON types are allowed (NumberInt, NumberLong, NumberDouble, NumberDecimal), but if the number is not an exact representation of 1 or -1, then &lt;tt&gt;$pop&lt;/tt&gt; will fail to parse.&lt;/p&gt;</description>
                <environment></environment>
        <key id="399077">SERVER-29912</key>
            <summary>$pop update modifier should validate that its argument is either 1 or -1</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="13201">Fixed</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Jun 2017 20:29:20 +0000</created>
                <updated>Mon, 30 Oct 2023 23:15:36 +0000</updated>
                            <resolved>Wed, 5 Jul 2017 16:51:30 +0000</resolved>
                                                    <fixVersion>3.5.10</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1614268" author="xgen-internal-githook" created="Wed, 5 Jul 2017 16:49:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29912&quot; title=&quot;$pop update modifier should validate that its argument is either 1 or -1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29912&quot;&gt;&lt;del&gt;SERVER-29912&lt;/del&gt;&lt;/a&gt; Require argument to $pop to be 1 or -1.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2f5f2f851a37a99b4b6e1cbcbf8826183777ab1c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2f5f2f851a37a99b4b6e1cbcbf8826183777ab1c&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="373571">SERVER-28769</issuekey>
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