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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>[CSHARP-35] BsonWriter.WriteValue throws System.InvalidCastException when serializing a float field.</title>
                <link>https://jira.mongodb.org/browse/CSHARP-35</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;When attempting to serialize a Document with a float field, BsonWriter.TranslateToBsonType returns BsonDataType.Number for System.Single types.&lt;/p&gt;

&lt;p&gt;In BsonWriter.WriteValue, an attempt is made to cast the object to double which is invalid since the object is of type System.Single:&lt;/p&gt;

&lt;p&gt;case BsonDataType.Number:&lt;br/&gt;
    writer.Write((double)obj);&lt;br/&gt;
    return;&lt;/p&gt;

&lt;p&gt;Here&apos;s a good article on the why &lt;a href=&quot;http://blogs.msdn.com/ericlippert/archive/2009/03/19/representation-and-identity.aspx&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://blogs.msdn.com/ericlippert/archive/2009/03/19/representation-and-identity.aspx&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;One possible fix would be:&lt;/p&gt;

&lt;p&gt;if (obj is System.Single) {&lt;br/&gt;
   writer.Write((double)(float)obj);&lt;br/&gt;
} else {&lt;br/&gt;
   writer.Write((double)obj);&lt;br/&gt;
}&lt;/p&gt;</description>
                <environment>Using pre-built binaries from 0.082.1.</environment>
        <key id="11672">CSHARP-35</key>
            <summary>BsonWriter.WriteValue throws System.InvalidCastException when serializing a float field.</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="sam">Sam Corder</assignee>
                                    <reporter username="dmarien">Doug Marien</reporter>
                        <labels>
                    </labels>
                <created>Thu, 1 Apr 2010 16:40:10 +0000</created>
                <updated>Thu, 1 Apr 2010 17:49:18 +0000</updated>
                            <resolved>Thu, 1 Apr 2010 17:49:18 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="13386" author="sam" created="Thu, 1 Apr 2010 17:49:18 +0000"  >&lt;p&gt;Will be released as part of 0.82.2&lt;/p&gt;</comment>
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