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    <title>MongoDB Jira</title>
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    <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>[GODRIVER-3044] Error when unmarshaling a BSON document if the document has unknown fields</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-3044</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;h3&gt;&lt;a name=&quot;Context&quot;&gt;&lt;/a&gt;&lt;b&gt;Context&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;&lt;font color=&quot;#505f79&quot;&gt;Some users want the ability to configure a BSON decoder to return an error if the BSON document has fields that don&apos;t match fields in the decode destination struct. The Go &quot;encoding/json&quot; library supports a similar configuration called &lt;a href=&quot;https://pkg.go.dev/encoding/json#Decoder.DisallowUnknownFields&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Decoder.DisallowUnknownFields&lt;/a&gt; . We should support something similar for the BSON decoder.&lt;/font&gt;&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Definitionofdone&quot;&gt;&lt;/a&gt;&lt;b&gt;Definition of done&lt;/b&gt;&lt;/h3&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;font color=&quot;#505f79&quot;&gt;Add a configuration that causes decoding to return an error if there are fields in the decoded BSON document that don&apos;t match fields in the decode destination struct. Note that this only makes sense when the destination is a struct.&lt;/font&gt;&lt;/li&gt;
	&lt;li&gt;&lt;font color=&quot;#505f79&quot;&gt;Add the ability to configure that unmarshal behavior on a MongoDB Client using &lt;tt&gt;BSONOptions&lt;/tt&gt;.&lt;/font&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;h3&gt;&lt;a name=&quot;Pitfalls&quot;&gt;&lt;/a&gt;&lt;b&gt;Pitfalls&lt;/b&gt;&lt;/h3&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;font color=&quot;#505f79&quot;&gt;Adds additional configuration to the &lt;tt&gt;bson.Decoder&lt;/tt&gt; type, which already has a lot of configurable behaviors.&lt;/font&gt;&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2494534">GODRIVER-3044</key>
            <summary>Error when unmarshaling a BSON document if the document has unknown fields</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="matt.dale@mongodb.com">Matt Dale</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 Nov 2023 18:56:03 +0000</created>
                <updated>Mon, 8 Jan 2024 22:57:49 +0000</updated>
                            <resolved>Mon, 8 Jan 2024 22:57:49 +0000</resolved>
                                                                    <component>BSON</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="795515">GODRIVER-1121</issuekey>
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