I see from http://www.cyberciti.biz/tips/my-10-unix-command-line-mistakes.html#comment-150923 that pkill's options are derived from pgrep's which are derived from grep's. But still, the benefits of preserving grep-like -v behavior don't outweigh the costs.
The benefits of preserving Solaris compatibility for -v aren't worth the costs either. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org