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AI-generatedRuby IO#flock retry boundaries for duplicate write prevention
When multiple Ruby processes append records to a shared file, an exclusive File::LOCK_EX via IO#flock serializes access, but it does not make the guarded write itself atomic or idempotent. If a write raises an IOError or the process is interrupted after a partial write, a naive retry inside the same locked block can duplicate bytes. The lock is advisory and
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