Package: aptitude
X-Debbugs-Cc: d...@gnui.org
Version: 0.8.13-3
Severity: normal

Dear maintainer,

aptitude(8) is unwilling to unset an apt.conf(5) option for a session when 
instructed to do so with `-o` flag and there does not seem to be any other way 
to do that.

## Steps to reproduce

        $ aptitude -o APT::Default-Release='' show
        -o requires an argument of the form key=value, got APT::Default-Release=

(judging by a result of any more meaningful command we can conclude that it 
indeed has not been unset).

## Expected results

aptitude(8) does allow to unset an option temporarily, and uses the 
above-mentioned syntax for that, since this is what tools from apt package 
understand already:

        $ apt-cache policy
        Package files:
         100 /var/lib/dpkg/status
             release a=now
         500 https://deb.debian.org/debian rc-buggy/main amd64 Packages
             release 
o=Debian,a=experimental,n=experimental,l=Debian,c=main,b=amd64
             origin deb.debian.org
         990 https://deb.debian.org/debian sid/main amd64 Packages
             release o=Debian,a=unstable,n=sid,l=Debian,c=main,b=amd64
             origin deb.debian.org
        Pinned packages:

        $ apt-cache -o APT::Default-Release='' policy
        Package files:
         100 /var/lib/dpkg/status
             release a=now
         500 https://deb.debian.org/debian rc-buggy/main amd64 Packages
             release 
o=Debian,a=experimental,n=experimental,l=Debian,c=main,b=amd64
             origin deb.debian.org
         500 https://deb.debian.org/debian sid/main amd64 Packages
             release o=Debian,a=unstable,n=sid,l=Debian,c=main,b=amd64
             origin deb.debian.org
        Pinned packages:

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