rails/rails — pull request #6267 by homakov (2012-05-11 09:42:33+00:00)
Title: No, it's false, by default + It's a not working option. 

First of all, it is false, since Rails 3.0,
* ActiveSupport.escape_html_entities_in_json now defaults to false.
* ActiveSupport.escape_html_entities_in_json from true to false to match previously announced Rails 3 defaults *DHH*