I'm wondering what went on under the hood when I passed an absurd rank
to Floor. Floor by default operates with rank 0 - it takes the floor
of each element. And that is what makes sense. Any other rank is
absurd.

But why didn't it blow up when forced to operate on 1-cells or
2-cells. In fact, why did it give the right answer?

  b =: 2  2 $ 4.5 6.7 8.8 9.8
   b
4.5 6.7
8.8 9.8
   <. b
4 6
8 9
   <."1 b
4 6
8 9
   <."2 b
4 6
8 9

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