Programmers regularly do this stuff under various names/phrases. "Make illegal states unrepresentable", "parse, don't validate", "resource acquisition is initia

Programmers regularly do this stuff under various names/phrases. "Make illegal states unrepresentable", "parse, don't validate", "resource acquisition is initialization", etc. It's all about encoding the fact that your structure isn't just data, but also represents some proof of provenance that guarantees some property. Scala is an industrial language that gives more tools than you might usually find for this while also letting you be pragmatic and integrate with Java's massive ecosystem (though you quickly learn you'd rather not because Java code tends to not do a good job of leveraging types in a sane way).