An enum can be marked with
@[Flags]. This changes the default values. The first constant's value is 1, and successive constants are multiplied by 2.
@[Flags] enum IOMode Read # 1 Write # 2 Async # 4 end (IOMode::Write | IOMode::Async).value # => 6 (IOMode::Write | IOMode::Async).to_s # => "Write | Async"
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