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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-50578] Round Decimal128::to{Int,Long,IntExact,LongExact,ULongExact} toward zero</title>
                <link>https://jira.mongodb.org/browse/SERVER-50578</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;BSONElement::numberInt &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/bson/bsonelement.h#L942&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;truncates&lt;/a&gt; fractional part of double&#160;using C-style cast.&lt;br/&gt;
For Decimal values this methods &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/bson/bsonelement.h#L948&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;uses&lt;/a&gt; Decimal128::toInt without any arguments. &lt;br/&gt;
This makes Decimal128::toInt to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/platform/decimal128.h#L362&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;use&lt;/a&gt; kRoundTiesToEven rounding strategy (round to nearest integer).&lt;br/&gt;
As a result BSONElement::numberInt has different truncation/rounding rules for double and Decimal128 which can be misleading (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32960&quot; title=&quot;$mod has inconsistent rounding/truncation behavior&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32960&quot;&gt;&lt;del&gt;SERVER-32960&lt;/del&gt;&lt;/a&gt;). &lt;/p&gt;

&lt;p&gt;Same is valid for&#160;BSONElement::numberLong&lt;/p&gt;

&lt;p&gt;The best fix is to default these methods to rounding toward zero. Examination of the call sites revealed a similar issue with document value.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1454318">SERVER-50578</key>
            <summary>Round Decimal128::to{Int,Long,IntExact,LongExact,ULongExact} toward zero</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="nikita.lapkov@mongodb.com">Nikita Lapkov</reporter>
                        <labels>
                            <label>indexv3</label>
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                <created>Thu, 27 Aug 2020 11:45:07 +0000</created>
                <updated>Fri, 27 Jan 2023 21:12:37 +0000</updated>
                                                                            <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
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