<pre>
$ pacman -Ss unarchiver
libre/unar 1.10.1-8.1
unar and lsar: Objective-C tools for uncompressing archive files
community/unarchiver 1.10.1-3
unar and lsar: Objective-C tools for uncompressing archive files
</pre>

the PKGBUILD for 'unar' in libre[1] is identical to the PKGBUILD for 'unarchiver' in archlinux community[2] - other than that the one in libre replaces, conflicts, and provides 'unarchiver' and 'unrar'[3] 'unrar'

the blacklist has 'unar' as a libre replacement for 'unrar' but does not mention 'unarchiver'[3]

unrar:unar:fsf:unrar:[nonfree][FIXME:description]

the missing description is not helpful here - 'unar' is clearly clear the 'unarchiver' program and not 'unrar' - so how does this qualify as a libre replacement?
arent the packages in libre supposed to be modified versions of some problematic program in arch? and not merely an unmodified alternative
so shouldnt 'unar' this just be a new package in PCR ? and the 'unrar' simply be blacklisted with no libre replacement because that program is not actually used

secondly the obvious, why are there two distinct packages available for the same program, with two different names, and especially when the one in libre 'replaces' the other?

[1]: https://git.parabola.nu/abslibre.git/plain/libre/unar/PKGBUILD
[2]: https://git.archlinux.org/svntogit/community.git/plain/trunk/PKGBUILD?h=packages/unarchiver
[3]: https://git.parabola.nu/blacklist.git/tree/blacklist.txt#n840