3.0.2

• Redis blocking dequeue no longer swallows ConnectionError -- the error propagates to the worker, which logs it and applies exponential backoff. Previously a downed redis server caused workers to busy-loop silently.
• Chord callbacks now fire when a member task is revoked, expired or cancelled by a pre-execute hook -- the skipped member contributes a None placeholder result. Previously the callback was silently lost.
• Scheduler skips missed periodic checks after a stall (e.g. suspend/resume) instead of running them back-to-back, which enqueued duplicate periodic tasks for the current minute.
• Fix inverted timeout clamp in wait_result() when using notify_result with redis < 6 (or an unknown server version): timeouts over one second were cut to 1s, and sub-second timeouts blocked indefinitely.
• put_if_empty() is now atomic for the memory and file storage backends, restoring lock_task() mutual exclusion on those backends.
• FileLock no longer unlinks an existing lock file at construction time, which broke mutual exclusion for any process already holding the lock.
• Process-worker task timeouts use signal.setitimer(), so float / sub-second timeouts work. Previously a timeout less than 1 second was silently ignored (alarm(0) cancels the timer) and fractional seconds were truncated.
• Consumer signal handlers only set flags -- logging and greenlet cleanup now happen in the main loop, avoiding re-entrant I/O from signal context.
• A user-supplied task kwarg named task is no longer dropped during serialization. Context tasks (context=True) inject the task instance into a copy of the kwargs rather than mutating the task's data.
• MemoryStorage.dequeue() and add_to_schedule() acquire the storage lock, like the other mutating methods.
• normalize_time() treats delay=0 as "now" rather than ignoring it, so e.g. expires=0 means "expires immediately" instead of "never expires".
• Redis enqueued_items(limit) returned limit + 1 items from the producer end of the queue; it now returns the next-limit items to be dequeued, matching the other storage backends.
• Redis-dependent tests are skipped when no local redis server is reachable, instead of failing at import time.

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