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Ability to limit which rubies are run via a file or ENV var #1
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I can see the arg and env var both being useful. For typical one-time usage, the arg list makes the most sense. However, I could see a particular setup wherein a single ruby version is "special" for some reason, and is generally excluded from any -each command. In that case, having the versions specified in a long-lived env var would make sense.
I would expect the arglist form to be recommended (and more common).