The golang-github-cznic-zappy package ships upstream code from 2016 and
appears unmaintained.  It has no reverse dependencies in Debian.

https://tracker.debian.org/pkg/golang-github-cznic-zappy

The upstream project was archived in 2018:

   github.com/cznic/zappy has moved to modernc.org/zappy (vcs).
   Please update your import paths to modernc.org/zappy.
   This repo is now archived.

If needed it should be packaged in a different source package name.

This removal request is part of a larger batch to remove 100+ unused
golang-*-dev packages from Debian.  I believe the QA cost associated
with keeping all of them is larger than the cost of (hopefully extremely
rare) re-introduction of any accidentally removed package if there is
ever any future need for it.  Meanwhile, I don't think it is useful to
keep this package in Debian.

/Simon

jas@frallan:~/dpkg/golang-qa-find-zombies$ ssh mirror.ftp-master.debian.org dak rm -Rn golang-github-cznic-zappy
Will remove the following packages from unstable:

golang-github-cznic-zappy | 0.0~git20160305.0.4f5e6ef-3 | source
golang-github-cznic-zappy-dev | 0.0~git20160305.0.4f5e6ef-3 | all

Maintainer: Debian Go Packaging Team <pkg-go-maintainers@lists.alioth.debian.org>
------------------- Reason -------------------

----------------------------------------------

Checking reverse dependencies...
No dependency problem found.

jas@frallan:~/dpkg/golang-qa-find-zombies$