ValueError when setting zmin, zmax for rgb image

There seem to be a validation error bug for setting zmin, zmax for rgb images. It appears the validation code expects a tuple or list of size 4 ( as would be the case for rgba) and not size 3 as should be the case for rgb.

im= np.random.randint(256,size=(50,50,3),dtype=np.uint8)
fig = go.Figure(go.Image(z=im,colormodel='rgb',zmin=[10,10,10],zmax=[100,100,100]))
fig.show()

Results in the following error:

File "C:\Users\NA\Anaconda3\lib\site-packages_plotly_utils\basevalidators.py", line 283, in raise_invalid_val

valid_clr_desc=self.description(),

ValueError:
Invalid value of type 'builtins.tuple' received for the 'zmax' property of image
Received value: [100, 100, 100]

The 'zmax' property is an info array that may be specified as:

* a list or tuple of 4 elements where:

(0) The 'zmax[0]' property is a number and may be specified as:
- An int or float
(1) The 'zmax[1]' property is a number and may be specified as:
- An int or float
(2) The 'zmax[2]' property is a number and may be specified as:
- An int or float
(3) The 'zmax[3]' property is a number and may be specified as:
- An int or float

Start by reproducing the provided NumPy and go.Image example with an RGB array and zmin/zmax values of length three. Trace the image property validation that raises the ValueError and compare it with RGBA handling. Done means RGB limits are accepted while existing RGBA validation remains correct.