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Can't save you your 30m now but `brew extract` should make this process much easier for future.

> Usage: brew extract [options] formula tap

> Look through repository history to find the most recent version of formula and create a copy in tap/Formula/formula@version.rb. If the tap is not installed yet, attempt to install/clone the tap before continuing.

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This is a poor way to handle library upgrades that are guaranteed to break any existing compiled binaries.

Frustrating that my PR to create readline@7 was rejected. https://github.com/Homebrew/homebrew-core/pull/36782

I would at least like to see some mechanism to exclude a Formula from automatic gc of old versions besides brew pin. Libraries don't take up significant space, and they cause a world of hurt to delete out from under compiled binaries, so there is not a good argument for automatically deleting them.

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