I see. That makes sense. Seems like the documentation for that environment variable could use some work, unless this behavior and the reasons for it already exi

I see. That makes sense. Seems like the documentation for that environment variable could use some work, unless this behavior and the reasons for it already exist elsewhere. Happy to submit a PR if needed. I do try to `brew upgrade` at least once a day, so that probably softens the blow of these automatic upgrades and explains why I haven't run into many problems with them. > the binary package for the thing you want requires the latest `readline` Have you considered trying to install the latest version of the thing that would be satisfied with the `readline` you already have installed (if it exists), or presenting the user with a choice on whether to upgrade or abort the install?