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I still think it is a Bad Idea to endorse -- explicitly or implicitly --
the idea that the number of digits tells you anything about the
uncertainty, tolerance, significance, or anything else.
Cutting a board to 3.8675309 ± 0.5 cm is not particularly difficult.
Cutting a board to 3.8675309 ± 0.0000005 cm is quite a bit more difficult.