I will literally switch OS to anything that can implement iTerm2's tmux integration.
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EDIT: the command is `tmux -uCC a` to connect to a tmux session, works locally and works over ssh. spawn the tmux session normally, disconnect, then connect via command mode for best results. you can still spawn a new one with just `tmux -uCC` but i have found i can get some issues when i spawn it in command mode vs attach in command mode.