Predefined colours in wxPython

I’m in the process of porting an application to python3/wx4 and just found why a bunch of my tests fail:

Python 3.8.5 (default, Jan 27 2021, 15:41:15) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import wx
>>> wx.RED
wx.Colour(-1, -1, -1, 255)
>>> wx.BLACK
wx.Colour(-1, -1, -1, 255)
>>> wx.BLUE
wx.Colour(-1, -1, -1, 255)
>>> wx.RED == None
True
>>> wx.RED == wx.BLACK
True
>>> 

It seems like all predefined colours have the same « null colour » value ?

Ubuntu 20.04, wxPython 4.1.1 (installed through pip in a venv)

Best regards
Jérôme Laheurte

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