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Document environment variable JULIA_PKG_PRESERVE_TIERED_INSTALLED #52362

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Document environment variable JULIA_PKG_PRESERVE_TIERED_INSTALLED #52362

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9 changes: 9 additions & 0 deletions doc/src/manual/environment-variables.md
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Expand Up @@ -251,6 +251,15 @@ If set to `true`, Pkg operations which use the git protocol will use an external

The accuracy of the package resolver. This should be a positive integer, the default is `1`.

### [`JULIA_PKG_PRESERVE_TIERED_INSTALLED`](@id JULIA_PKG_PRESERVE_TIERED_INSTALLED)

Change the default package installation strategy to `Pkg.PRESERVE_TIERED_INSTALLED`
to let the package manager try to install versions of packages while keeping as many
versions of packages already installed as possible.

!!! compat "Julia 1.9"
This only affects Julia 1.9 and above.

## Network transport

### [`JULIA_NO_VERIFY_HOSTS`](@id JULIA_NO_VERIFY_HOSTS)
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