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BUG: Correct derivative for exponential transform. #1540
I think this is only "half" a bug, and I thought it was tested.
At the optimum, the score is approximately zero. multiplying it by a factor doesn't make any difference, (except for convergence tolerance in score which, I think, we don't check.)
The only problem was in the optimization itself, especially further away from the optimum or with a messy case like this.