What are the benefits & drawbacks of installing things into the @global gemset in RVM?

NOTE: I wrote this whole response assuming that you are using Bundler to manage your gem dependencies. I realize that some people don't, and you didn't mention Bundler in your question. If you aren't using Bundler, I would point out that it probably is the best way to conserve disk space (only if you bundle install --system though!).

If you are using exported gemsets to manage dependencies, I think your scheme sounds reasonable, but I have no experience with it.

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