Change type of Extensions (#762)

* Change type of Extensions, update changelog * Add pr number Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com> --------- Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
encode · Jul 28, 2023 · c86d507 · c86d507
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## Unreleased
 
+- Change the type of `Extensions` from `Mapping[Str, Any]` to `MutableMapping[Str, Any]`. (#762)
 - Handle HTTP/1.1 half-closed connections gracefully. (#641)
 
 ## 0.17.3 (5th July 2023)

diff --git a/httpcore/_models.py b/httpcore/_models.py
@@ -6,6 +6,7 @@
     Iterator,
     List,
     Mapping,
+    MutableMapping,
     Optional,
     Sequence,
     Tuple,
@@ -20,7 +21,7 @@
 HeadersAsMapping = Mapping[Union[bytes, str], Union[bytes, str]]
 HeaderTypes = Union[HeadersAsSequence, HeadersAsMapping, None]
 
-Extensions = Mapping[str, Any]
+Extensions = MutableMapping[str, Any]
 
 
 def enforce_bytes(value: Union[bytes, str], *, name: str) -> bytes: