Correctly invoke async router callback asynchronously

[lqqyt2423]

Sometimes this error occurs:
RangeError: Maximum call stack size exceeded

This pull request can fix the error.

[dougwilson]

Thanks! Please add a test case or leave in the pr a demo of the issue and we can make it in to a test case.

[lqqyt2423]

@dougwilson Please see the new commit

[dougwilson]

Great, thank you! Would you be willing to open the same PR over at https://github.com/pillarjs/router ?

[dougwilson]

Without looking at the current v8 stack frames, there is no way to know if you still have 100 frames left to use. Also params will add/remove to how many frames are used in each iteration, I wouldn't think. How did you come up with the number 100 for this?

[lqqyt2423]

pillarjs/router@e96ebf5

[lqqyt2423]

@dougwilson router repo already fixed it: pillarjs/router@e96ebf5

I have a new commit to fix stack overflow with a large sync stack: 538a789

[dougwilson]

Ah, I guess we didn't port that over, lol! Thanks for pointing that out. I'll port that commit over to 4.18 🎉