I think you have your W and H mixed up in your example and test suite.
Thanks James, I've fixed it now.
I also used round, but I not seen to be the best solution.
36.6/20.6==16/9 is false.
The values from the test suite are also inaccurate.
vectorization in N
Back to basics 10 - Max Float
Pernicious Anniversary Problem
N-Dimensional Array Slice
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