The three local until-polling copies let the debounced detail updates
land outside act — React warned 19 times per run. They collapse into
one shared act-per-tick until in the kit: timers and promise chains
only fire while a tick's sleep is awaiting, so the updates stay
act-attributed and commit as each scope exits.
The four browser specs that arm the fetch-on-miss retry with a
deliberately failing fetcher silence the production console.warn the
failure legitimately emits, restored by a file-level afterEach.
A default-reporter run now prints zero stderr.
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