imago
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Optimize TURN for 90°/180°/270° scenarios
Moved from #14
Use aops:turn
from https://github.com/bendudson/array-operations/pull/34 (once it gets merged) in order to optimize orthogonal rotations of images - there is no need to do trigonometry at that point, just moving bytes around.
The PR is merged - we should be able to depend on updated array-operations
now, and deliver any updated Imago starting from the next Quicklisp release.