📝Version numbers version package interface as a whole

Versioning assign a single version number to the package’s interface (and implementation) as a whole. This includes both explicit and Implicit interface.

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📝 A major version bump does not imply incompatibility
📝 § Package management and versioning
📝 Dependencies’ version constraints require additional maintenance work
📝 Version number communicates version of the interface and of its implementation
📝 Interface is second-class for package managers