Conflicting URI templates

Hi,

I'm trying to implement the following two resources

```
/foo/{id}
/foo/{id}/bar
```

But when adding the second route, falcon complains with an error: "The URI template for this route conflicts with another route's template".

I had seen some progress on similar issues (#564, #647) but I'm not sure if these fixes work for the described pattern too or when this will be merged/released.

So, is there any kind of workaround for the described URI patterns?

Thanks