diff --git a/litellm/types/files.py b/litellm/types/files.py
index e351a8cba37..259a836d9ad 100644
--- a/litellm/types/files.py
+++ b/litellm/types/files.py
@@ -250,36 +250,38 @@ Other FileType Groupings
 """
 # Accepted file types for GEMINI 1.5 through Vertex AI
 # https://cloud.google.com/vertex-ai/generative-ai/docs/multimodal/send-multimodal-prompts#gemini-send-multimodal-samples-images-nodejs
-GEMINI_1_5_ACCEPTED_FILE_TYPES: Final[set[FileType]] = {
-    # Image
-    FileType.PNG,
-    FileType.JPEG,
-    FileType.WEBP,
-    # Audio
-    FileType.AAC,
-    FileType.FLAC,
-    FileType.MP3,
-    FileType.MPA,
-    FileType.MPEG,
-    FileType.MPGA,
-    FileType.OPUS,
-    FileType.PCM,
-    FileType.WAV,
-    FileType.WEBM,
-    # Video
-    FileType.FLV,
-    FileType.MOV,
-    FileType.MPEG,
-    FileType.MPEGPS,
-    FileType.MPG,
-    FileType.MP4,
-    FileType.WEBM,
-    FileType.WMV,
-    FileType.THREE_GPP,
-    # PDF
-    FileType.PDF,
-    FileType.TXT,
-}
+GEMINI_1_5_ACCEPTED_FILE_TYPES: Final[frozenset[FileType]] = frozenset(
+    {
+        # Image
+        FileType.PNG,
+        FileType.JPEG,
+        FileType.WEBP,
+        # Audio
+        FileType.AAC,
+        FileType.FLAC,
+        FileType.MP3,
+        FileType.MPA,
+        FileType.MPEG,
+        FileType.MPGA,
+        FileType.OPUS,
+        FileType.PCM,
+        FileType.WAV,
+        FileType.WEBM,
+        # Video
+        FileType.FLV,
+        FileType.MOV,
+        FileType.MPEG,
+        FileType.MPEGPS,
+        FileType.MPG,
+        FileType.MP4,
+        FileType.WEBM,
+        FileType.WMV,
+        FileType.THREE_GPP,
+        # PDF
+        FileType.PDF,
+        FileType.TXT,
+    }
+)
 
 
 def is_gemini_1_5_accepted_file_type(file_type: FileType) -> bool:
diff --git a/litellm/types/guardrails.py b/litellm/types/guardrails.py
index 329b043c019..60c3830fbef 100644
--- a/litellm/types/guardrails.py
+++ b/litellm/types/guardrails.py
@@ -171,15 +171,13 @@ class GuardrailItem(BaseModel):
         enabled_roles: list[Role] | None = default_roles,
         callback_args: dict[str, dict] | None = None,
     ) -> None:
-        if callback_args is None:
-            callback_args = {}
         super().__init__(
             callbacks=callbacks,
             default_on=default_on,
             logging_only=logging_only,
             guardrail_name=guardrail_name,
             enabled_roles=enabled_roles,
-            callback_args=callback_args,
+            callback_args=callback_args or {},
         )
 
 
diff --git a/litellm/types/integrations/slack_alerting.py b/litellm/types/integrations/slack_alerting.py
index a96e70ff496..56616c00aa0 100644
--- a/litellm/types/integrations/slack_alerting.py
+++ b/litellm/types/integrations/slack_alerting.py
@@ -30,7 +30,7 @@ class OutageModel(BaseOutageModel):
 
 class ProviderRegionOutageModel(BaseOutageModel):
     provider_region_id: str
-    deployment_ids: set[str]
+    deployment_ids: set[str]  # mutable-ok: outage state accumulates ids via .add() and round-trips the cache as a list
 
 
 # we use this for the email header, please send a test email if you change this. verify it looks good on email
diff --git a/litellm/types/utils.py b/litellm/types/utils.py
index 1a022e58495..0d34ca21cef 100644
--- a/litellm/types/utils.py
+++ b/litellm/types/utils.py
@@ -1220,7 +1220,7 @@ ChatCompletionMessage(content='This is a test', role='assistant', function_call=
 def add_provider_specific_fields(object: BaseModel, provider_specific_fields: dict[str, Any] | None) -> None:
     if not provider_specific_fields:  # set if provider_specific_fields is not empty
         return
-    object.provider_specific_fields = provider_specific_fields
+    object.provider_specific_fields = provider_specific_fields  # rebind-ok: sets the field on the caller's model
 
 
 class Message(SafeAttributeModel, OpenAIObject):