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List of different generic types, dynamic casting
foreach(var entry in myList)
{
    var obj = (Sth<A, entry.Key>) entry.Value;
    myMethod(obj); //This can have overloads for object, Sth<A,int>, Sth<A,string>,
                   // etc. Generally, I need a correct type of obj here.
}

foreach (KeyValuePair<A, object> entry in myList)
{
    dynamic value = entry.Value;
    myMethod(value);
}