Another reason to avoid instance variables into Rails controllers? /2
They have an insane implementation:
(still in rails head)
# Define some internal variables that should not be propagated to the view. self.protected_instance_variables = [ :@_status, :@_headers, :@_params, :@_env, :@_response, :@_request, :@_view_runtime, :@_stream, :@_url_options, :@_action_has_layout ]