Requesting Assistance:Seeking Guidance on Utilizing "SourceGenerator" for Generic Custom Formatters. #1646

[Union(0, typeof(Test1))]
[Union(1, typeof(Test2))]
public abstract class Test<T>
{
    [Key(0)]
    public Dictionary<string, T> Children { get; set; }
}

[MessagePackObject]
public class Test1 : Test<string>
{
}

[MessagePackObject]
public class Test2 : Test<Color>
{
}

[Union(0, typeof(Test1))]
[Union(1, typeof(Test2))]
public abstract class Test<T>
{
    [Key(0)]
    [MessagePackFormatter(typeof(CustomDictionaryFormatter<,>))]               //Not working
    [MessagePackFormatter(typeof(CustomDictionaryFormatter<string,T>))]        //Not working
    public CustomDictionary<string, T> Children { get; set; }
}

[MessagePackObject]
public class Test1 : Test<string>
{
}

[MessagePackObject]
public class Test2 : Test<Color>
{
}

public sealed class CustomDictionaryFormatter<TKey, TValue> : DictionaryFormatterBase<TKey, TValue, CustomDictionary<TKey, TValue>, CustomDictionary<TKey, TValue>.Enumerator, CustomDictionary<TKey, TValue>> where TKey : notnull
{
    protected override void Add(CustomDictionary<TKey, TValue> collection, int index, TKey key, TValue value, MessagePackSerializerOptions options)
    {
        collection.Add(key, value);
    }
    protected override CustomDictionary<TKey, TValue> Complete(CustomDictionary<TKey, TValue> intermediateCollection)
    {
        return intermediateCollection;
    }
    protected override CustomDictionary<TKey, TValue> Create(int count, MessagePackSerializerOptions options)
    {
        return new CustomDictionary<TKey, TValue>(count, options.Security.GetEqualityComparer<TKey>());
    }
    protected override CustomDictionary<TKey, TValue>.Enumerator GetSourceEnumerator(CustomDictionary<TKey, TValue> source)
    {
        return source.GetEnumerator();
    }
}

[Union(0, typeof(Test1))]
[Union(1, typeof(Test2))]
public abstract class Test<T>
{
    [IgnoreMember]
    public abstract CustomDictionary<string, T> Children { get; set; }
}

[MessagePackObject]
public class Test1 : Test<string>
{
    [Key(0)]
    [MessagePackFormatter(typeof(CustomDictionaryFormatter<string, string>))]
    public override CustomDictionary<string, string> Children { get; set; }
}

[MessagePackObject]
public class Test2 : Test<Color>
{
    [Key(0)]
    [MessagePackFormatter(typeof(CustomDictionaryFormatter<string, Color>))]
    public override CustomDictionary<string, Color> Children { get; set; }
}

public sealed class CustomDictionaryFormatter<TKey, TValue> : DictionaryFormatterBase<TKey, TValue, CustomDictionary<TKey, TValue>, CustomDictionary<TKey, TValue>.Enumerator, CustomDictionary<TKey, TValue>> where TKey : notnull
{
    protected override void Add(CustomDictionary<TKey, TValue> collection, int index, TKey key, TValue value, MessagePackSerializerOptions options)
    {
        collection.Add(key, value);
    }
    protected override CustomDictionary<TKey, TValue> Complete(CustomDictionary<TKey, TValue> intermediateCollection)
    {
        return intermediateCollection;
    }
    protected override CustomDictionary<TKey, TValue> Create(int count, MessagePackSerializerOptions options)
    {
        return new CustomDictionary<TKey, TValue>(count, options.Security.GetEqualityComparer<TKey>());
    }
    protected override CustomDictionary<TKey, TValue>.Enumerator GetSourceEnumerator(CustomDictionary<TKey, TValue> source)
    {
        return source.GetEnumerator();
    }
}