* feat(proxy): let one streaming request opt into usage.cost with x-litellm-include-cost-in-streaming-usage
The global include_cost_in_streaming_usage flag moved every stream off the
fast path. A request can now send x-litellm-include-cost-in-streaming-usage: true
to get usage.cost on its usage-carrying stream event (/v1/messages and the
Anthropic and OpenAI pass-throughs) while requests without the header keep the
fast path. The global flag keeps working unchanged.
Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* test: type the new stream cost header tests
* fix(types): keep reportUnknownArgumentType at its merge-base count
* fix(proxy): the stream cost header only accepts true
---------
Co-authored-by: devin-ai-integration[bot] <158243242+devin-ai-integration[bot]@users.noreply.github.com>
07c7229895