Find recursive references for Serializables to eliminate "Serialization depth limit 10 exceeded ... There may be an object composition cycle in one or more of your serialized classes." warning in Unity

GetSerializationRecursiveReferences.cs

// this helped me trace & eliminate a bug with this warning:
// Serialization depth limit 10 exceeded at '<Type>.<Field>'. There may be an object composition cycle in one or more of your serialized classes.
public static IEnumerable<FieldInfo> GetRecursiveReferences<T>()
{
    foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
    {
        foreach (var type in assembly.GetTypes())
        {
            if (!type.IsDefined(typeof(System.SerializableAttribute), true))
                continue;

            foreach (var field in type.GetFields(BindingFlags.Public | BindingFlags.NonPublic |
                                                 BindingFlags.Instance | BindingFlags.DeclaredOnly))
            {
                if (field.IsDefined(typeof(NonSerializedAttribute), false))
                    continue;

                if (field.FieldType == typeof(T))
                    yield return field;

                else if (field.FieldType.IsGenericType && field.FieldType.GetGenericTypeDefinition() ==
                         typeof(System.Collections.Generic.List<>))
                {
                    if (typeof(T).IsAssignableFrom(field.FieldType.GenericTypeArguments[0]))
                        yield return field;
                }
            }
        }
    }
}