fix: avoid rebinding optional mutable inputs

litellm/llms/infinity/common_utils.py

@@ -5,8 +5,7 @@ from litellm.llms.base_llm.chat.transformation import BaseLLMException
 
 class InfinityError(BaseLLMException):
     def __init__(self, status_code: int, message: str, headers: dict | httpx.Headers | None = None):
-        if headers is None:
-            headers = {}
+        resolved_headers = {} if headers is None else headers
         self.status_code = status_code
         self.message = message
         self.request = httpx.Request(method="POST", url="https://github.com/michaelfeil/infinity")
@@ -16,5 +15,5 @@ class InfinityError(BaseLLMException):
             message=message,
             request=self.request,
             response=self.response,
-            headers=headers,
+            headers=resolved_headers,
         )  # Call the base class constructor with the parameters it needs

litellm/llms/vertex_ai/gemini/transformation.py

@@ -618,9 +618,8 @@ def check_if_part_exists_in_parts(parts: list[PartType], part: PartType, exclude
     Check if a part exists in a list of parts
     Handles both camelCase and snake_case key variations (e.g., function_call vs functionCall)
     """
-    if excluded_keys is None:
-        excluded_keys = []
-    keys_to_compare: Final = set(part.keys()) - set(excluded_keys)
+    resolved_excluded_keys = [] if excluded_keys is None else excluded_keys
+    keys_to_compare: Final = set(part.keys()) - set(resolved_excluded_keys)
     for p in parts:
         p_keys = set(p.keys())
         # Check if all keys in part have equivalent values in p