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If xterm.js is slower than tmux, why don't you just use tmux for the headless sessions as well? How is tmux not headless enough?

Not everyone has tmux. I default to tmux if you have it and fallback to xterm.js

Ah, ah, got it. So you get a kind of graceful degradation if the optional dependency is missing. Nice!

And, I guess, it's headless in the sense that you can't attach to it even if you want to. I get what you meant now.