Changed logic of interface id in evaluation logic as follows: - Only the highest level id is used for memorization. - Usage of interface id is customizable relative to the embedded expression. 
Changed logic of interface id in evaluation logic as follows:
- Only the highest level id is used for memorization.
- Usage of interface id is customizable relative to the embedded
expression. 

Signed-off-by: Jakob Brandsborg Ehmsen <387ed33cc9ebf98b733caa2520baacd616b28aa5@gmail.com>
jakobehmsen/duro