Improve performance by avoiding unneeded promise wrapping #292
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This very simple PR avoids wrapping the return value from the request handler in another promise. The request handler will either return a promise or a value that can be consumed directly. When running example 99 with included benchmarking instructions, this simple change improves performance from ~2400 req/s to ~2500 req/s on my local machine.
Builds on top of #291