When you’re a ruby/rails novice, you’re told the Gemfile is used to list gems required by the project, but nobody cares too much about describing (or learning) the available configuration options: after all, it’s just the gems list.
Sooner or later you will have problems with gems and Gemfiles, mainly compatibility and version issues, so it’s better to know what you’re dealing with.
If you strive for the Gemfile Master badge then go and read this article, it’s complete and well written, kudos to the author!
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