Specify createTrailingSlashRoutes as an instance property when extending from Backbone.Subroute

[aeksco]

I'm in a situation where I have the following:

class App.Routers.SuperRouter extends Backbone.SubRoute
  createTrailingSlashRoutes: true
  ...

from which I extend:

class App.Routers.Books extends App.Routers.SuperRouter
  ...

I've noticed that the createTrailingSlashRoutes: true instance property is applied to neither App.Routers.SuperRouter nor the routers extending from it. This appears to be the result of backbone.subroute.js line 38:

this.createTrailingSlashRoutes = options && options.createTrailingSlashRoutes;

indicating that the createTrailingSlashRoutes option must be supplied to the router when it's instantiated. It looks like this would be a simple change:

this.createTrailingSlashRoutes ||= options && options.createTrailingSlashRoutes;

and I would like to know wether this is worth doing before I go through the process of throwing together a PR. For the time being I am supplying my own constructor:

class App.Routers.SuperRouter extends Backbone.SubRoute
  constructor: (route, opts = {}) ->
    super(route, _.extend opts, { createTrailingSlashRoutes: true })
  ...

Let me know your thoughts when you've got a moment - thanks!