Exactly zero of the Rails apps on Heroku will break.

When you create a new app you'll need to remove a line from the autogenerated .gitignore in order to work the way you expect.

No?

I am repeating what Heroku's Ruby platform lead said here: https://github.com/rails/rails/commit/61b91c4c55bcbd5a2ec85d...

You actually removed the word "new" from the middle of his sentence, which IMO changes the meaning substantially.

It does, yes. This is my bad. I do not use rbenv, personally. Let's see if HN will let me edit it.