jpalardy/vim-slime — pull request #5 by KTamas (2011-11-24 18:00:20+00:00)
Title: Fix missing !exists

The `!exists` variable check was missing when tmux was set as the default
slime option, so it was always set to tmux even if the user set it to
"screen" in his/her vimrc.

(I do find `screen` to be a more sensible default than `tmux`, though, given that this plugin was originally created for `screen`. But that's just my $0.02)