ManyToMany should allow doublets.

E.g. if i have:

public class Car
{
    public Car() {}

    [PrimaryKey]
    public string Name { get; set; }
    public string Data{ get; set; }
    [ManyToMany(typeof(Cars_Wheels))]
    public List<Wheel> Wheels{ get; set; }
}

public class Wheel
{
    public Wheel() {}

    [PrimaryKey]
    public string Name { get; set; }
    public int Diameter{ get; set; }
    [ManyToMany(typeof(Cars_Wheels))]
    public List<Car> Cars{ get; set; }
}

public class Cars_Wheels
{
    [ForeignKey(typeof(Car))]
    public string CarName{ get; set; }

    [ForeignKey(typeof(Wheel))]
    public string WheelName{ get; set; }
}

I want to have several wheels (of the same type) on one (or several cars) I can't at the moment. As of this line (578) of code in the function UpdateManyToManyForeignKeys in the file WriteOperatons.cs:

var missingChildKeyList = childKeyList.Where(o => !currentChildKeyList.Contains(o)).ToList();

Removes all with the same PK. An ugly solution is to replace that line of code with the following:

foreach (var child in currentChildKeyList)
{
    missingChildKeyList.Remove(child);
}

There are probably smarter ways of doing it ...

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