I was able to perform what I'm talking about in an initializer, maybe it can 
help seeing the big picture:

```ruby
ActionController::Responder.class_eval do
  def to_format
    if has_errors?
      api_behavior(nil) and return
    end

    controller.response.status = :created if post? && ! has_errors?

    default_render
  rescue ActionView::MissingTemplate => e
    api_behavior(e)
  end
end
```

Now I understand a lot better Rails view stack.
As for my problem, the culprit is this line in mime_responds.rb:

```
collector = Collector.new { default_render }
```

which calls the default view without options (I guess this is a 
functionality and not a bug since it's name is "default_render").

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