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74e8fdb5a7
The flag's row promised "one JSON object on stdout" and stopped there. Running the error paths, most verbs print nothing on stdout at all — `capture %999`, `procs %999`, `tab close @99`, `ws rm nosuch`, `tab rename @99 x` each exit 1 with the message on stderr and an empty stdout. A reader that parses stdout without checking the exit code first gets an empty string where it expected an object. Two verbs deliberately do the opposite, because there the bad news is the answer: `pane close` prints `failed[]` and `wait` prints the state it gave up in. Both are already pinned by tests, so this only writes down the rule they are exceptions to. `run` looked like a third exception and is not: a child exiting nonzero is the verb succeeding. Checked rather than assumed — `run --json -- sh -c 'exit 3'` prints its object and exits 3 — and the row now says so, since that is the case most likely to be misread as a failure that kept its JSON.