Now it is
# Upgrade $TERM
set -g default-terminal "screen-256color"
but why not
# Upgrade $TERM
set -g default-terminal "tmux-256color"
tmux color term enables italic font and ensure more color consistency with xterm-256color which is usually the case outside tmux.
Now it is
but why not
tmux color term enables italic font and ensure more color consistency with
xterm-256colorwhich is usually the case outsidetmux.