MLKit, some research languages
This is what personal computing was supposed to be before everything moved into walled-garden SaaS apps and proprietary databases. Files are the original open protocol. And now that AI agents are becoming the primary interface to computing, files are becoming the interoperability layer that makes it possible to switch tools, compose workflows, and maintain continuity across applications, all without anyone's permission.
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So, why are these orphan instances disallowed? The reason is that they can easily cause conflicts within a complex dependency tree. Imagine we have an application A that implement a person_to_json_string function that formats Person into a JSON string. Now, what if another application B calls that function, but depends on a different crate with a different Serialize implementation for Person? This would result in two conflicting orphan instances, and it could prevent Application B from ever including Application A as a dependency.
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