perf: typeof will be faster (vs instanceof)

[nigrosimone]

typeof will return one of the built in types (Object, undefined and the primitives). The instanceof operator should check the prototype chain and see if the right side has been used as a constructor somewhere along. This is naturally more work.

[dimdenGD]

I check if its Regexp, not if its object

[nigrosimone]

Pattern only can be "string" or "RegExp" (object)

typeof seem faster https://jsperf.app/typeof-function-vs-instanceof/5

[dimdenGD]

There's no point in making this function faster, it only gets called once during server init. And even if it was called on every request, this is still pretty much a pointless microoptimization that probably brings like +1 req/sec benefit... No point