Kwargs LiteLLM code introduces for its own use were only kept out of provider
bodies if someone also listed them in all_litellm_params. Undeclared ones went
into extra_body or optional_params, reached the provider, and the provider
rejected the request. is_litellm_owned_kwarg in types/utils.py now defines
LiteLLM-owned once: a registered name, or any name starting with
INTERNAL_KWARG_PREFIX from litellm/constants.py. Every filter that builds
provider params from kwargs uses it: chat completion, transcription,
embedding, image generation and edit, search and video, ElevenLabs text to
speech, and the Bedrock batch mapper. The two untyped shared filters now take
Mapping[str, object]
The stream_chunk_size wire test becomes test_internal_params_wire.py. It also
sends an undeclared _litellm_ kwarg and asserts that no _litellm_ key reaches
any of the six provider bodies, while extra_body passthrough keeps working
Refs LIT-8318, LIT-8319
Migrate 18 provider test files from tests/test_litellm/llms to tests/unit/llms.
194 kept tests move as-is after mutation testing; 1 test deleted
(test_completion_datarobot_with_environment_variables, env-gated no-assert);
the fixture-only fal_ai cost calculator file is removed.
Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
