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as per discussion today there are certainly cases where you've already responded and still require the means to delegate errors. For example if you respond immediately and then in that same function kick off a job, and that job fails you'll still want to handle these in a centralized way to perform the regular logging etc. These additional next(err) calls would not invoke the error-handling middleware because the response is already made, so in that sense it's not very intuitive
closing for the same reason as #522 (comment)