Problem

I would like it if the area painted by fill_between aligned properly with a plot that has draw_style flags

Proposed Solution

I would propose to add draw_style to fill_between

Additional context and prior art

Having a plot_date that has drawstyle="steps-post" if you use fill_between the area that is painted is just the area like if the drawstyle was set to the default value and generates a filled area that does not fit inside the lines.
What I am proposing here is that fill_between has the option to receive the same drawstyle that exists in as an example in plot_date so that the area that is filled with color and the lines of the plot are aligned properly.