Description:

For python mimetypes module relies on the /etc/mime.types file, provided by mailcap (or actual mime-types provider).

The dependency is implicit: mimetypes does not present an error condition on lack of /etc/mime.types, rather provides a stub. However, this results in unreliable deployment for a program that utilizes the mimetypes module. While this is basically a flaw of the Python ecosystem, Arch can mitigate the issue by adding the optional dependency.

Additional info:
* package version(s): seen with python 3.10.1-2

Steps to reproduce:

$ pacman -Q mailcap
error: package 'mailcap' was not found
$ python -c 'import sys,mimetypes; print(mimetypes.guess_type(sys.argv[1]))' foo.mkv
(None, None)
...
$ pacman -Q mailcap
mailcap 2.1.53-1
$ python -c 'import sys,mimetypes; print(mimetypes.guess_type(sys.argv[1]))' foo.mkv
('video/x-matroska', None)