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C# records provide value equality and init-only properties that make them suitable for DTOs and domain models at trust boundaries. This architecture note covers the minimal design, validation patterns, shallow immutability limits, and when to switch to entity semantics.
PHP 8.1 backed enums turn scattered magic strings into a closed set of type-safe values. Learn the migration path, a worked repository example, and the serialization trade-offs.
Use Ceylon’s union/intersection types and null‑safe optionals to build a small, JVM‑friendly domain model. This guide maps requirements to a minimal design, defines interop boundaries, and lists operational checks and failure modes.
A technical guide on using Haxe algebraic data types to build type-safe, serializable domain models across JS, Neko, and C++ targets.
csharp
haxe