Microsoft's TypeScript-first structured-output library — schema validation across LLM responses. Less popular than Instructor but well-engineered.
From Wikipedia
In film, television, and theatre, typecasting is the process by which a particular actor becomes strongly identified with a specific character, one or more particular roles, or characters having the same traits or coming from the same social or ethnic groups. There have been instances in which an actor has been so strongly identified with a role as to make it difficult for them to find work playing other characters.