Why is respond_with being removed from rails 4.2 into it’s own gem?

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Rationale from David Heinemeier Hansson (creator of Ruby on Rails):

I’d like to take this opportunity to split respond_with/class-level
respond_to into an external plugin. I’m generally not a fan of the
code that comes out of using this pattern. It encourages model#to_json
and it hides the difference between HTML and API responses in ways
that convolute the code.

So how about we split this into a gem for 4.2, with the current
behavior, but also with an option to get the new behavior as suggested
here through a configuration point.

Full discussion at this link:

https://github.com/rails/rails/pull/12136#issuecomment-50216483

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