drupflare/worker - v1.0.4
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    Variable PARK_SLEEP_SCHEMEConst

    PARK_SLEEP_SCHEME: "cfwpark+sleep://" = 'cfwpark+sleep://'

    The scheme a parked wait arrives under, cfwpark+sleep://<ms>; must match Park::SLEEP_SCHEME. The clock is frozen across a synchronous _run(), so the host waits on a timer (wall, no CPU).