type PathParam = Path ? "*" | "/*" : Path ? unknown : _PathParam<Path>
Examples: "/a/b/" -> "" ":a" -> "a" "/a/:b" -> "b" "/a/blahblahblah:b" -> "b" "/:a/:b" -> "a" | "b" "/:a/b/:c/" -> "a" | "c" | ""
