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I would be nice for any language that supported annotations(TypeScript, C#, python, etc) if we could somehow annotate the same code in different files while maintaining a single source of property truth.. A combination of interfaces and class annotations for combining them could work..

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I don't know if this is what you mean, but Aspect Oriented Programming was a hot topic for a very short period in the early 2000's, especially in the enterprise Java community. Ultimately it didn't seem to find many use cases and the buzz died down pretty quick.

https://en.wikipedia.org/wiki/AspectJ

The hype wave is gone, but if you ever saw @Secured or @Transactional, those are aspects after all.

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