Предотвращение шаблона при контакте со многими несвязанными типами

Это - мой (в большой степени под влиянием D.Jennings) универсальная реализация метода сравнения (в C#):

/// <summary>
/// Represents a service used to compare two collections for equality.
/// </summary>
/// <typeparam name="T">The type of the items in the collections.</typeparam>
public class CollectionComparer<T>
{
    /// <summary>
    /// Compares the content of two collections for equality.
    /// </summary>
    /// <param name="foo">The first collection.</param>
    /// <param name="bar">The second collection.</param>
    /// <returns>True if both collections have the same content, false otherwise.</returns>
    public bool Execute(ICollection<T> foo, ICollection<T> bar)
    {
        // Declare a dictionary to count the occurence of the items in the collection
        Dictionary<T, int> itemCounts = new Dictionary<T,int>();

        // Increase the count for each occurence of the item in the first collection
        foreach (T item in foo)
        {
            if (itemCounts.ContainsKey(item))
            {
                itemCounts[item]++;
            }
            else
            {
                itemCounts[item] = 1;
            }
        }

        // Wrap the keys in a searchable list
        List<T> keys = new List<T>(itemCounts.Keys);

        // Decrease the count for each occurence of the item in the second collection
        foreach (T item in bar)
        {
            // Try to find a key for the item
            // The keys of a dictionary are compared by reference, so we have to
            // find the original key that is equivalent to the "item"
            // You may want to override ".Equals" to define what it means for
            // two "T" objects to be equal
            T key = keys.Find(
                delegate(T listKey)
                {
                    return listKey.Equals(item);
                });

            // Check if a key was found
            if(key != null)
            {
                itemCounts[key]--;
            }
            else
            {
                // There was no occurence of this item in the first collection, thus the collections are not equal
                return false;
            }
        }

        // The count of each item should be 0 if the contents of the collections are equal
        foreach (int value in itemCounts.Values)
        {
            if (value != 0)
            {
                return false;
            }
        }

        // The collections are equal
        return true;
    }
}