io.github.libtmux.Pane.Pane.paste

Nothing in the text is looked up as a key name, so a line containing Enter or a bracket arrives as those characters. That is what an editor, a REPL, or anything reading a here-document needs, and it is the difference from #send .

tmux needs a buffer to paste from, and this one travels in the same invocation as the paste that consumes it. A caller that stops in between therefore cannot leave the text in the paste history every session on the server can read.

The text goes to tmux on standard input rather than as an argument, so it is not bounded by the size of a tmux command and never reaches tmux's parser.