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flexlock-cb v2.2.1

A locking library like [`mutexify`](https://github.com/mafintosh/mutexify), [`mutex-js`](https://github.com/danielglennross/mutex-js), [`await-lock`](https://www.npmjs.com/package/await-lock), and [many more](https://www.npmjs.com/search?q=promise+lock), but with more flexibility in how to use it to be both sturdier and very quick.

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