code: func (r *Router) SkipClean(value bool) *Router {
  	r.skipClean = value
  	return r
  }
docs: // SkipClean defines the path cleaning behaviour for new routes. The initial
  // value is false. Users should be careful about which routes are not cleaned
  //
  // When true, if the route path is "/path//to", it will remain with the double
  // slash. This is helpful if you have a route like: /fetch/http://xkcd.com/534/
  //
  // When false, the path will be cleaned, so /fetch/http://xkcd.com/534/ will
  // become /fetch/http/xkcd.com/534