Aperture units are ignored when providing vertices

Coding
1

When you create a rectangular aperture using 4 vertices, the aperture object ignores the units that I specify in the object creation. Instead, it keeps the units of the window.

from psychopy import visual

import numpy as np

stimWin = visual.Window(
    [1000,800],screen = 0,fullscr = False,
    monitor = 'tryMonitor',units = 'deg',allowStencil = True,
    )

gratingBack = visual.GratingStim(
    stimWin,tex = 'sqr',mask = None,units = 'deg',
    maskParams = None,pos = (0.0, 0.0),size = [30],sf = 0.5,
    ori = 0.0,phase = (0.0, 0.0),texRes = 128,contrast = 0.9,
    opacity = 1.0,autoDraw = False
    )

mask = np.array([(-5, 3),(-5, -3),(5, -3),(5, 3)])

rectMak = visual.Aperture(
    stimWin,
    size = 1,
    units = 'pix',
    shape = mask,
    )

for i in range(120):
    gratingBack.phase += 0.01
    gratingBack.draw()
    stimWin.flip()

changing the units value of the rectMask in ‘deg’, or ‘norm’ does not have any effect.
Is this the expected behavior? Is there a way to specifically select units for the aperture that are different from the window’s unit?