| Class | ActionController::Routing::Optimisation::PositionalArguments | 
| In: | lib/action_controller/routing/optimisations.rb | 
| Parent: | Optimiser | 
Given a route
map.person '/people/:id'
If the user calls person_url(@person), we can simply return a string like "/people/#{@person.to_param}" rather than triggering the expensive logic in url_for.