Why not versioning the dotnet-install scripts?

[o-l-a-v]

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It'd be beneficial to version the dotnet-install scripts, as in make actual releases of them.

• Make it easier to manage it with package managers.
• Compare local version vs. newest version, instead of re-downloading the whole script to be sure one is up to date.
• Signal minor vs major/braking changes, following semantic versioning.
• And other benefits of having something versioned.

Somewhat related:

• #121