1.4.0 BETA: DictionaryContainsKey no longer works

This unit no longer works for me. The code has changed from

public bool Contains(Recursion recursion)
		{
			var dictionary = this.dictionary.GetValue<IDictionary>(recursion);
			var key = this.key.GetValue<object>(recursion);
			
			return dictionary.Contains(key);
		}

to 

public bool Contains(Recursion recursion)
		{
			var dictionary = this.dictionary.GetValue<IDictionary>(recursion);
			var key = this.key.GetValue<IDictionary>(recursion);
			
			return dictionary.Contains(key);
		}

so the key now has to be a dictionary!? For me its usually a string.