My PR to Bundler was merged!
This fixes the issue: Warn if the same gem (same version) is added twice. bundler/bundler-features#22
Try it out: Open a Gemfile in on of your projects and duplicate one of your gems.
do a bundle install
You should get a warning telling you that you have a duplicated gem and what it is.
This is the warning you'll see:
"Your Gemfile lists the gem #{current.name} (#{current.requirement}) more than once. You should probably keep only one of them. While it's not a problem now, it could cause errors if you change the version of just one of them later."
Yay!!
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