How to fix rails faye thin memory leaks?

Question

Ruby on Rails

Rails 4.1.4 ruby ​​2.2
Faye controller looks like this

class RealAppointmentsController < FayeRails::Controller
end

Mounted like this

config.middleware.delete Rack::Lock
config.middleware.use FayeRails::Middleware, mount: '/faye', :timeout => 25 do
   map '/appointments' => RealAppointmentsController
   map :default => :block
end

Used as SSE, because all implementations of SSE on rails look like mountains of crutches.
Called from standard controller methods like this

RealAppointmentsController.publish('/appointments', @appointment.to_json)

If possible, in the right places, the subscription is canceled on the client through
subscription.cancel();
And nevertheless, the server eats off 5-15 MB from the system for each client. Even taking into account the fact that ruby ​​does not return the occupied memory to the system, sooner or later it must stop taking memory from the system, but this does not happen. Those. in development with one client and a bunch of page updates, it systematically eats up all the memory.