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you have 10 fingers and 10 toes. 10+10=20. So instead of 5.20, he named it 6.0

But 20 is countable with fingers and toes.

Not if you start from 0 :)

Wouldn't 0 just be all toes and fingers clenched?

Counting with fingers is 1-based.

Linus made an off by one error :)