Dear APT Maintainers,

apt-cache showsrc should understand the same "apt-cache showsrc
<srcpkg>=<version>" syntax as "apt-cache show" does.

This bug-report is very similar to https://bugs.debian.org/613664, but
is about a different syntax which is also not understood by "apt-cache
showsrc".

Feel free to merge both issues if they would be implemented in
the same place and at the same time. But please update the title of the
merged bug report(s) to sport both missing syntax variants so that this
fact doesn't get lost.