Any way to avoid nested case statements for proc taking two variant objects?

[hugogranstrom]

That's very true, a macro can solve most abstractions. It's always more 
convenient to use a macro someone else maintains instead of trying to find bugs 
in your own niche code ;) For you, I can totally understand that it's of utmost 
importance to get every ounce of speed out of it. Nim's meta programming must 
really be fantastic for those sort of repetitive low level stuff when you can 
abstract away a lot of the work.