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    <p>I will answer your question partially (because I do not know much about C#).</p> <p><strong>So what will you lose if you will store decimals as strings.</strong></p> <ul> <li>your numbers on average would weight more (each double number <a href="http://bsonspec.org/#/specification">cost 8 bytes to store</a> which means that every string that has more then 8 chars will weight more). Because of these your indexes (if they will be built on this field would grow)</li> <li>you will not be able to use operators which takes numbers as arguments <a href="http://docs.mongodb.org/manual/reference/operator/update/inc/#up._S_inc">$inc</a>, <a href="http://docs.mongodb.org/manual/reference/operator/update/bit/#up._S_bit">$bit</a>, <a href="http://docs.mongodb.org/master/reference/operator/query/mod/#op._S_mod">$mod</a>, <a href="http://docs.mongodb.org/master/reference/operator/update/min/#up._S_min">$min</a>, <a href="http://docs.mongodb.org/master/reference/operator/update/max/#up._S_max">$max</a> and in 2.6 version <a href="http://docs.mongodb.org/master/reference/operator/update/mul/#up._S_mul">$mul</a>. (May be I forgot something)</li> <li>you will not be able to compare numbers (may be '1.65' and '1.23' is comparable as a string, but definitely not numbers with e and minuses somewhere in between). Because of this operations which build on top of comparison like <a href="http://docs.mongodb.org/manual/reference/method/cursor.sort/">$sort</a>, and all these <a href="http://docs.mongodb.org/manual/reference/operator/query/gt/">$gte, $gt, $lte, $lt</a> will not work correctly.</li> </ul> <p><strong>What will you lose in precision if you store decimal as double</strong>:</p> <ul> <li>based on <a href="http://msdn.microsoft.com/en-us/library/364x0z75.aspx">this, Decimal in C#</a> has 28-29 significant digits, whereas looking at my first link and checking the <a href="http://en.wikipedia.org/wiki/Double-precision_floating-point_format#IEEE_754_double-precision_binary_floating-point_format%3a_binary64">spec for double precision</a> you see that it has 15-17 significant digits. This is basically what you will lose</li> <li>another really important thing which people sometimes forget when dealing with double floats is illustrated below:</li> </ul> <p>.</p> <pre><code>db.c.insert({_id : 1, b : 3.44}) db.c.update({_id : 1},{$inc : {b : 1}}) db.c.find({b: 4.44}) // WTf, where is my document? There is nothing there </code></pre> <p><strong>Regarding the 2-nd subquestion:</strong> </p> <blockquote> <p>Is there a way to set a default serialization of decimals as double (AllowTruncation) without having to put an Attribute on each property?</p> </blockquote> <p>I do not really understood it, so I hope someone would be able to answer it.</p>
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