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Merge pull request #9 from phiggins/🔢#⃣🚶

🔢#⃣🚶
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Merge pull request #10 from tony612/add-open-for-io

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Merge pull request #12 from tony612/add-empty-to-array

empty?
Merge pull request #11 from tony612/add-mutex

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Merge pull request #8 from JuanitoFatas/feature/to-hash

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:beer: :bee:, :outbox_tray: :inbox_tray: