m05-type-driven

SKILL.md

| Pattern | Don't Just Say | Ask Instead |

| Primitive obsession | "It's just a string" | What does this value represent? | | Boolean flags | "Add an isvalid flag" | Can states be types? | | Optional everywhere | "Check for None" | Is absence really possible? | | Validation at runtime | "Return Err if invalid" | Can we validate at construction? |

| What types to create | m09-domain | What's the domain model? | | State machine design | m09-domain | What are valid transitions? | | Marker trait usage | m04-zero-cost | Static or dynamic dispatch? |

CRITICAL: Use for type-driven design. Triggers: type state, PhantomData, newtype, marker trait, builder pattern, make invalid states unrepresentable, compile-time validation, sealed trait, ZST, 类型状态, 新类型模式, 类型驱动设计 Source: zhanghandong/rust-skills.

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