Content block discriminator serialized twice ("type":"text","type":"text")

[krickert]

Observed on 0.14.0, still present on main.

ContentBlock is annotated @JsonTypeInfo(use = Id.NAME, property = "type") and the concrete records (TextContent, ImageContent, ...) also declare a @JsonProperty("type") String type component. Serializing a session/prompt request therefore emits the key twice:

"prompt":[{"type":"text","type":"text","text":"hello"}]

Strict JSON parsers reject duplicate keys; lenient ones silently take the first or last value. Emit the discriminator once (or drop the record component).