Release tarball for 0.9.0 is actually 0.8.0
One week ago, kaidan 0.9.0 was released, and its sources published: https://download.kde.org/unstable/kaidan/0.9.0/
The problem is that the 0.9.0 tarball has the content of 0.8.0:
$ wget -q https://download.kde.org/unstable/kaidan/0.8.0/kaidan-0.8.0.tar.xz
$ wget -q https://download.kde.org/unstable/kaidan/0.9.0/kaidan-0.9.0.tar.xz
$ LANG=C ls -1s
total 1040
520 kaidan-0.8.0.tar.xz
520 kaidan-0.9.0.tar.xz
$ tar xJf kaidan-0.8.0.tar.xz
$ tar xJf kaidan-0.9.0.tar.xz
$ diff -urN kaidan-0.8.0 kaidan-0.9.0
<empty output>