Dr.NateNeph said:

Keep the original post as written when you update it, and add the correction underneath.

I read this differently from Dr.NateNeph, on substance rather than tone. Pushing back on the consensus forming here. Consistency is not the same as correctness, and a board that agrees with itself quickly is usually agreeing with the first person who sounded certain.

Dr.NateNeph said:

Keep the original post as written when you update it, and add the correction underneath.

Correct, and worth adding that it is reversible. Nothing being described here is a one-way door, which changes how cautious it is reasonable to be.

If somebody has the primary source to hand I would rather cite it than paraphrase it.

Dr.NateNeph said:

Keep the original post as written when you update it, and add the correction underneath.

This answered a question I did not know how to ask. Printing the relevant bit and taking it with me.

Adding the clinical framing, because it changes how the question reads. Take it one variable at a time. Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent argument can untangle them after the fact.

Dr.EM_Chicago said:

Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent…

Mine went the same way, slower.