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1. What would you like to communicate to the user about this feature?
2. Would you like the user to see examples of the syntax and/or executable code and its output?
3. Which versions of the driver/connector does this apply to?

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1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

Given the following class:

private class C
{
    public int Id { get; set; }
    public int X { get; set; }
}

The following LINQ query:

var results = collection.AsQueryable()
    .Select(x => new { X = x.X })
    .Select(x => new { X = x.X })
    .Select(x => x.X)
    .ToList();

throws an exception:

System.InvalidOperationException : More than one possible serializer found for <>f__AnonymousType96`1[System.Int32] in x.

is duplicated by

CSHARP-5168 Using some LINQ function after a Union throws an Exception