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On Fri, Jul 17, 2020 at 8:43 PM Roberto Ierusalimschy wrote:
    However, Lua may call the method one more time.

Let me summarize.
A to-be-closed variable may be closed 0, 1 or 2 times:
0: due to os.exit()
1: normal behavior
2: due to run-time error in the closing method