Merge pull request #482 from uyha/skip-same-type

skip conversion if the object is already the correct type
yukinarit · Mar 3, 2024 · 769fbbd · 769fbbd
2 parents 35901de + 0b453e2
commit 769fbbd
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/serde/de.py b/serde/de.py
@@ -407,6 +407,11 @@ def from_obj(c: Type[T], o: Any, named: bool, reuse_instances: Optional[bool]) -
 
     res: Any
 
+    # It is possible that the parser already generates the correct data type requested
+    # by the caller. Hence, it should be checked early to avoid doing anymore work.
+    if type(o) is c:
+        return o
+
     def deserializable_to_obj(cls: Type[T]) -> T:
         serde_scope: Scope = getattr(cls, SERDE_SCOPE)
         func_name = FROM_DICT if named else FROM_ITER