Orientation of y-axis in Heatmap

The default orientation of the y-axis in the Heatmap graph is, at least to me, unexpected. The 0,0 coordinate of the plot is in the lower left corner. A heatmap is generally used to display a matrix, such as an image, however, and the 0,0 index into the matrix would be in the top left corner. An image is thus displayed flipped upside down. One can of course flip the z array or provide the values for y in reversed order, but this keeps the labelling of the axis and the display of y,x in the hover window unaffected. I like the way this is handled in matplotlib.pyplot.imshow, which provides an origin argument.
An additional argument for the Heatmap graph to control the orientation of the y-axis would be nice.

Heatmap グラフのエントリポイントから始め、y 軸とホバーラベルがどのように扱われているかを調べます。要求された動作を matplotlib.pyplot.imshow の origin 引数と比較してください。任意の orientation 引数によって表示される y 方向を制御でき、軸ラベルとホバー座標の整合性が保たれ、両方の向きをカバーできれば完了です。