feat: lib.externals support.

[aitboudad]

fix #49 and #56.

[dherges]

Hi @aitboudad,

thanks for your effort!

I will look at it at the latest on monday and then publish another pre-release!

First impression: looks good! Tests are still green! Thank you!

[dherges]

Yes, fantastic!

Thanks @aitboudad! 🌟

[aitboudad]

Thanks!

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