chore: add a note regarding the type annotation and conversion

Author: alessio-locatelli

aiohttp_client_cache/backends/base.py

@@ -83,6 +83,8 @@ def __init__(
         self.responses: BaseCache = DictCache()
 
         self.include_headers = include_headers
+
+        # Converted to `set` for fast `in` checks inside `filter_ignored_params`.
         self.ignored_params = set(ignored_params or [])
 
     @property

aiohttp_client_cache/cache_keys.py

@@ -46,7 +46,11 @@ def create_key(
     return key.hexdigest()
 
 
-def filter_ignored_params(data, ignored_params: Iterable[str]):
+def filter_ignored_params(
+    data,
+    # Always a set internally, but keep the public utility parameter as-is to avoid breaking changes.
+    ignored_params: Iterable[str],
+):
     """Remove any ignored params from an object, if it's dict-like"""
     if not isinstance(data, Mapping) or not ignored_params:
         return data