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.

Comienza en el punto de entrada del gráfico Heatmap e inspecciona cómo se gestionan su eje y y las etiquetas al pasar el cursor; compara el comportamiento solicitado con el argumento origin de matplotlib.pyplot.imshow. Se considera completado cuando un argumento orientation opcional controla la dirección y mostrada, mientras las etiquetas de los ejes y las coordenadas al pasar el cursor siguen siendo coherentes, con cobertura para ambas orientaciones.