Invalid type when using generics and MongoDiscriminated

[nekresh]

When using the attribute [MongoDiscriminated] on a generic class, the type string return by ReflectionHelper.GetTypeDiscriminator() is truncated and not valid which lead to an exception when using it in Type.GetType().

With the following code :

class Program
{
    [Norm.MongoDiscriminated]
    class Error<T>
    { }

    static void Main(string[] args)
    {
        var helper = new Norm.BSON.ReflectionHelper(typeof(Error<int>));
        Console.WriteLine(helper.GetTypeDiscriminator());
    }
}

I get the following type :
test.norm.Program+Error`1[[System.Int32, mscorlib

When the valid type would have been :
test.norm.Program+Error`1[[System.Int32, mscorlib]], test.norm