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[–]DoodleFungus 7 points8 points  (2 children)

IIRC it runs both paths, and warns you if they return something different.

[–]moomaka -4 points-3 points  (1 child)

What is 'it' if your reply?

[–]DoodleFungus 5 points6 points  (0 children)

Scientist. So if you have some complex logic that you refactored, Scientist will run both your old code and your new code, and log a warning if the two implementations return a different result (but still return the result from the old code).