Swift compatibility between versions for a library

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From Apple’s website:

Binary Compatibility and Frameworks

While your app’s runtime compatibility is ensured, the Swift language
itself will continue to evolve, and the binary interface will also
change. To be safe, all components of your app should be built with
the same version of Xcode and the Swift compiler to ensure that they
work together.

This means that frameworks need to be managed carefully. For instance,
if your project uses frameworks to share code with an embedded
extension, you will want to build the frameworks, app, and extensions
together. It would be dangerous to rely upon binary frameworks that
use Swift — especially from third parties. As Swift changes, those
frameworks will be incompatible with the rest of your app. When the
binary interface stabilizes in a year or two, the Swift runtime will
become part of the host OS and this limitation will no longer exist.

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