One concrete data point for the thread. Practical: whatever you change, write down the date and the reason. In three months the reason is what you will have forgotten, and the reason is what makes the record worth having.
Following on from hyun_seoul — and this may be the naive question:
How long did you give it before you decided it was working?
stefan_berlin said:Practical: whatever you change, write down the date and the reason.
There is a second half to this that has not been said yet. Whatever the answer turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, and invite the correction. That is slower than asserting, and it is the only version that survives being wrong.
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Closing the loop. The answer turned out to depend on the detail I had left out of the opening post, which is a lesson about how to ask rather than about the subject.
Dr.PulmRoch said:Whatever the answer turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, and invite the…
That is right for the common case. Whether it is right for the case being asked about depends on a detail that has not been given.