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And rbenv doesn't nest. If your Ruby program execs another Ruby program, rbenv won't use the correct interpreter.

Who needs gemsets? Isn't that the point of Bundler?

Thank you for this, I did not realize it was the case but it definitely makes sense. Back to using gemsets I suppose...

I'd rather do gemsets than preface commands with "bundle exec"

yes! Though I just discovered the other day you can use the --binstubs option which obviates the need to use bundle exec in the project

Isn't that exchanging bundle exec command for ./bin/command ? Still not as convenient as just using command

Yeah, the plugin architecture is cool. There's one for bundler, too: https://github.com/carsomyr/rbenv-bundler