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`plt.subplots` tries to be special, and return array or not-array depending on a number of subplots.
It is not actually helpful, and IMHO bad design.
Make it always `ndarray`.
The `and not type(axes) is np.ndarray`, is just in case matplotlib decides to make their behavior more uniform. For now work around it.
Also, no need for `ndarray.flat` really.
Confirmed to work with existing benchmarks (i.e. rows=2, cols=3), and with single graphs (rows=1, cols=1).
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