Python 3.13 alpha breaks explain() about scons

[mwichmann]

As an FYI:

C:\Users\mats\Documents\github\scons>py -3.12
Python 3.12.2 (tags/v3.12.2:6abddd9, Feb  6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> s = r'\users\mats'
>>> os.path.isabs(s)
True
>>> ^Z

C:\Users\mats\Documents\github\scons>py -3.13
Python 3.13.0a5 (tags/v3.13.0a5:076d169, Mar 12 2024, 21:29:03) [MSC v.1938 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> s = r'\users\mats'
>>> os.path.isabs(s)
False
>>> ^Z

[mwichmann]

Seems like this and #4502 are the same issue after all, rooted in the str_to_node methods in FileNodeInfo and DirNodeInfo.

[mwichmann]

Completed by #4505