Just to put it into perspective:
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this post was submitted on 25 Jan 2024
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Why wouldn't they just say a millimeter? .1cm is something a non metric user would say.
I think you’ve answered your own question!
As an imperialist, i would have opted for 1/256"
It's common for scientists to prefer a decimal point in their measurements because they are inherently limited precision, but "1 mm" leaves some ambiguity as to whether you meant 1.0 mm or 0.1 cm. It's a matter of significant digits, since leading zeros are ignored.
It is literally prefized with "roughly".