String
Wrapper for streaming a scalar string result from an LLM.
When passing String::class to createObjectStreamWithThinking(), the generated schema {"type":"string"} causes the LLM to return bare strings instead of JSON objects, which the streaming parser cannot recognize as structured output.
Use StringResult instead — it produces schema {"type":"object","properties":{"value":{"type":"string"}}} so the LLM returns {"value":"..."} which is correctly parsed and emitted as an object event.