Example: ActiveSupport::JSON.backend = "JSONGem"

  All internal Rails JSON encoding is now handled by ActiveSupport::JSON.encode().  Use of #to_json is not recommended, as it may clash with other libraries that overwrite it.  However, you can recover Rails specific functionality
  if you really want to use #to_json.

    gem 'json'
    ActiveSupport::JSON.backend = "JSONGem"

    class ActiveRecord::Base
      alias to_json rails_to_json
    end

  * Decouple from ActionController and ActionMailer
  * Bring back localization support.
  * Prepare to decouple templates from the filesystem.
  * Prepare to decouple localization from ActionView
  * Fix ActionMailer to take advantage of ActionView::Path

Reinstate Base#render_to_string. Introduce AbstractController#render_to_string which stringifies render_to_body.

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Don't set Content-Length in Base#response_body= since body may be any Rack-compatible body. Leave it up to the content length middleware.

Rename render_to_string to render_to_body since it may return any Rack-compatible body, not just strings

define surface area of the class.