Bug#675527: description gives no clear mention of when one can remove grub-common

Package: grub2-common
Version: 1.99-22
Severity: wishlist

It is very confusing to find all of
$ aptitude search ~ngrub~i
i   grub-common                                     - GRand Unified Bootloader (common files)
i   grub-pc                                         - GRand Unified Bootloader, version 2 (PC/BIOS version)
i A grub-pc-bin                                     - GRand Unified Bootloader, version 2 (PC/BIOS binaries)
i A grub2-common                                    - GRand Unified Bootloader (common files for version 2)
installed on my system.

I wish I knew when it was safe to remove grub-common.