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> I think this was added in another section of this doc. See the second paragraph in 
> https://docs.python.org/3/library/os.html#file-names-command-line-arguments-and-environment-variables
Right, this section now explains encodings and the error handler.
Moreover, I recently reworked the documentation of the filesystem encoding and error handler:
* https://docs.python.org/dev/glossary.html#term-filesystem-encoding-and-error-handler
* https://docs.python.org/dev/library/os.html#python-utf-8-mode
* https://docs.python.org/dev/library/sys.html#sys.getfilesystemencoding
* etc.
I consider that it's now enough, I close the issue ;-) If someone wants to enhance the doc, please submit a PR. This issue is now quite old :-)