Suppose I have a score of X for tag A and a score of Y for tag B.
Now suppose that B becomes a synonym of A (A is the master).
Would my score for tags A and B change?
I can think of several options :
My score for tag A will become X + Y (assuming I have no upvoted answers tagged with both A and B. If such overlap does exist, my new score for tag A will be lower) and my score for B will be gone.
No change. Tag synonyms don't affect tag scores.
The score of A will become X + Y (under the same assumptions as in 1) and the score of B won't change.
The first option makes the most sense to me. Does anybody know what's the implemented logic?