Use longest match for ctx._matchedRoute, fixes #478 #492
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Fixes #478 by using the longest path, or the length of path string as a tiebreaker to determine "most specific layer"
I tried to implement it without replacing RegExp.prototype.test with something that like RegExp.prototype.exec which returns more match information, as that would decrease routing performance.
This does subtly change the behavior of koa-router, though. Is 5.x release planned soon, and will it fix #478 ?