tmux returns a listing as plain lines, so what separates one field from the next is whatever string the client put between them — and tmux gives no character a special meaning there. Any fixed choice is therefore something a user can put in a window name. A window named with the separator turns an n-field template into n+1 fields and shifts everything after it, so a pane id arrives where a name belongs, and nothing downstream can tell.
The separator is generated once per process instead. Colliding with it means naming a window with the exact token this process happened to produce. ## Members - `of` (method) — A format over the given tmux format names, in the order rows will report them. - `template` (method) — The argument to pass to tmux's {@code -F}. - `separator` (method) — The token this process separates fields with. - `terminator` (method) - `size` (method) — How many fields a row must have. - `Row` (class) — One row's values, addressed by the field name that asked for them. - `rows` (method) — Reads a whole listing back into rows. - `split` (method) — Reads one row back into its fields.