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Restriction on editing closed questions

Guidelines to prove that $2^{\sqrt{2}}$ is a transcendental number? question bumped into https://mathoverflow.net/ after making an edit.

I am not sure if that adds anything to the question.

Should there be restriction on who edits a closed question? Even though if it is just tags. How about restricting the right to edit to just the one who asked the question?

I am not able to see the point of editing a 6 years old question.