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Versions docs: Add note on unstable versions

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Lukas Bestle 2020-03-01 11:32:48 +01:00 committed by GitHub
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@ -9,6 +9,7 @@ Versioned formulae we include in [homebrew/core](https://github.com/homebrew/hom
* Versioned software should build on all Homebrew's supported versions of macOS.
* Versioned formulae should differ in major/minor (not patch) versions from the current stable release. This is because patch versions indicate bug or security updates and we want to ensure you apply security updates.
* Unstable versions (alpha, beta, development versions) are not acceptable, not even for versioned formulae.
* Upstream should have a release branch for the versioned formulae version and still make security updates for that version, when necessary. For example, [PHP 5.5 was not a supported version but PHP 7.2 was](https://php.net/supported-versions.php) in January 2018.
* Formulae that depend on versioned formulae must not depend on the same formulae at two different versions twice in their recursive dependencies. For example, if you depend on `openssl@1.0` and `foo`, and `foo` depends on `openssl` then you must instead use `openssl`.
* Versioned formulae should only be linkable at the same time as their non-versioned counterpart if the upstream project provides support for it, e.g. using suffixed binaries. If this is not possible, use `keg_only :versioned_formula` to allow users to have multiple versions installed at once.