Why is the cursor not at the expected position? In this configuration, where the bottom edges of this object are at world origin coordinates (0,0,0), and this edge has a length of 0.196m, why is the cursor not at the expected position when I give it a 0,0,0.196 location?..

What's the right way to put the cursor where I want it to be?
Answer was simple enough: dimensions of the object have been manually changed, it messed with the scale of the object and Z scale value was a little bit under 1.0. Distances appear to be mesured before taking scale into account.