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Coroutines & Scheduler
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Event loop (libuv)
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spawn() / delay() / timeout()
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TaskGroup & TaskSet
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Channels (buffered/unbuffered)
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Future / FutureState
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Pool with CircuitBreaker
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Async File & Pipe I/O
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TCP / UDP sockets
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PDO connection pooling
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FileSystemWatcher
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CURL async
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Deadlock diagnostics
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ThreadPool
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Test suite
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API stabilization
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Telemetry
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Framework integration layer
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Laravel / Symfony adapters
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Migration guides
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Feature freeze
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Community testing
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Performance benchmarks
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Stable API
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Production ready
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PHP RFC submission