>> Anyway, who's going to notice if the last step is 0.4mm less that the 
>> others?
>
> ...which was why I was amused at the stairs having dimensions to the 
> nearest mm. ;-)
>
> Seriously, if I take a tape measure to the finished building, do you 
> really think all the measurements will be exactly whole numbers of 
> millimeters? I somewhat doubt it. ;-)

No, but it's a typical value with some tolerance.  On our drawings we always 
have stuff that is labelled like 16.68 +/- 0.20 mm, if they made all the 
parts with an average of 16.66 mm then some of them wouldn't fit together 
properly.

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