[arch-general] list of user/group ids supplied by official packages

[member graysky]

Is there a list of user/group IDs that official packages from [core]
[extra] and [community] provide?  I wish to insure that the user/group
id in an AUR package I provide[1] does not conflict a user created by
an official package.  I can grep for 'useradd' in my abs tree and
parse through the resulting 137 lines but there must be a better way.
Thanks.

1. https://aur.archlinux.org/packages/kodi-standalone-service