diff --git a/src/automerge/core/__init__.py b/src/automerge/core/__init__.py
index fa61a26..14482eb 100644
--- a/src/automerge/core/__init__.py
+++ b/src/automerge/core/__init__.py
@@ -7,25 +7,25 @@
 Value = ObjType | tuple[ScalarType, ScalarValue]
 
 def extract(doc: Document, obj_id: bytes = ROOT) -> Thing:
-    match doc.object_type(obj_id):
-        case ObjType.Map:
-            d: dict[str, Thing] = {}
-            for k in doc.keys(obj_id):
-                x = doc.get(obj_id, k)
-                assert x is not None
-                v, id = x
-                d[k] = extract(doc, id) if isinstance(v, ObjType) else v[1]
-            return d
-        case ObjType.List:
-            l: list[Thing] = []
-            for k2 in range(0, doc.length(obj_id)):
-                x = doc.get(obj_id, k2)
-                assert x is not None
-                v, id = x
-                l.append(extract(doc, id) if isinstance(v, ObjType) else v[1])
-            return l
-        case ObjType.Text:
-            return doc.text(obj_id)
+    ot = doc.object_type(obj_id)
+    if ot == ObjType.Map:
+        d: dict[str, Thing] = {}
+        for k in doc.keys(obj_id):
+            x = doc.get(obj_id, k)
+            assert x is not None
+            v, id = x
+            d[k] = extract(doc, id) if isinstance(v, ObjType) else v[1]
+        return d
+    elif ot == ObjType.List:
+        l: list[Thing] = []
+        for k2 in range(0, doc.length(obj_id)):
+            x = doc.get(obj_id, k2)
+            assert x is not None
+            v, id = x
+            l.append(extract(doc, id) if isinstance(v, ObjType) else v[1])
+        return l
+    elif ot == ObjType.Text:
+        return doc.text(obj_id)
     raise Exception("unexpected result from doc.object_type")
 
 __doc__ = _automerge.__doc__
diff --git a/src/automerge/document.py b/src/automerge/document.py
index 69adb28..350fde3 100644
--- a/src/automerge/document.py
+++ b/src/automerge/document.py
@@ -40,11 +40,10 @@ def to_py(self) -> core.Thing:
     def _maybe_wrap(self, x: tuple[core.Value, bytes]) -> 'MapReadProxy | ListReadProxy | core.ScalarValue':
         value, obj_id = x
         if isinstance(value, core.ObjType):
-            match value:
-                case core.ObjType.List:
-                    return ListReadProxy(self._doc, obj_id, self._heads)
-                case core.ObjType.Map:
-                    return MapReadProxy(self._doc, obj_id, self._heads)
+            if value == core.ObjType.List:
+                return ListReadProxy(self._doc, obj_id, self._heads)
+            elif value == core.ObjType.Map:
+                return MapReadProxy(self._doc, obj_id, self._heads)
             raise Exception("unknown obj type")
         _, v = value
         return v
@@ -142,11 +141,10 @@ def __getitem__(self, key: int | slice) -> MutableProxyThing | MutableSequence[M
         if x is None: return None
         value, obj_id = x
         if isinstance(value, core.ObjType):
-            match value:
-                case core.ObjType.Map:
-                    return MapWriteProxy(self._tx, obj_id, self._heads)
-                case core.ObjType.List:
-                    return ListWriteProxy(self._tx, obj_id, self._heads)
+            if value == core.ObjType.Map:
+                return MapWriteProxy(self._tx, obj_id, self._heads)
+            elif value == core.ObjType.List:
+                return ListWriteProxy(self._tx, obj_id, self._heads)
             raise Exception("unknown ObjType")
         _, v = value
         return v