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9d86397243
Using an async operation with `io.use()` could lead to the creation of
several instances of a same namespace, each of them overriding the
previous one.
Example:
```js
io.use(async (nsp, auth, next) => {
await anOperationThatTakesSomeTime();
next();
});
```
Related: https://github.com/socketio/socket.io/pull/4136