Is state-machine gem threadsafe! or can it be used in a multi-threaded rails app.

[bg]

I was wondering if the state-machine gem was threadsafe. Can I use it in a multi-threaded rails app. It seems rails-4 will have 'config.threadsafe!' as 'true' by default in production: http://tenderlovemaking.com/2012/06/18/removing-config-threadsafe.html

In my case, I want to know if it is safe to use the state-machine gem in either  normal ruby threads or with the celluloid gem that uses the actor approach to concurrency.

Many thanks.

[bg]

It seems Pluginaweek state-machine is unsuitable for use in any multi-threaded rails app. That is my conclusion since no one responded suggesting it is unsuitable.

In the meantime I am reading around and might try this celluloid gem's -finite-state-machine implemenetation, since it comes inbuilt into the celluloid gem which uses the actor pattern for multi-threading:

https://github.com/celluloid/celluloid/blob/master/lib/celluloid/fsm.rb

[bg]

It seems  Pluginaweek state-machine is threadsafe based on:

http://railsplugins.org/plugins/278-state-machine?criterion_id=2&version_id=3779