public class MyDocumentType {
   public decimal Number {get;set;}
}

public static void Main() {
    var validDecimalString = "9.300000190734863";
    var validDecimal = Decimal.Parse(validDecimalString);
    Console.WriteLine(validDecimalString + " --> " + validDecimal);
    Console.WriteLine();

    var myValidDecimalJson = "{\"Number\": 9.300000190734863 }";
    try 
    {
        var obj = BsonSerializer.Deserialize<MyDocumentType>(myValidDecimalJson);
        Console.WriteLine(myValidDecimalJson + " --> " + obj.Number);
    }
    catch (Exception e)
    {
        Console.WriteLine(myValidDecimalJson + " ---> " + e.GetType().Name + ": " + e.Message);
    }


//Sample output:
// 9.300000190734863 --> 9.300000190734863
//
// {"Number": 9.300000190734863 } ---> FormatException: An error occurred while deserializing the Number property of class VetDB.Tests.My.SampleDeserialisations+MyDocumentType: Truncation resulted in data loss.