fix(sagemaker-core): preserve falsy values in serialize() output

sagemaker-core/src/sagemaker/core/utils/utils.py

@@ -538,9 +538,11 @@ def _serialize_dict(value: Dict) -> dict:
         dict: The serialized dict
     """
     serialized_dict = {}
+    # Drop only Unassigned/None; preserve valid falsy values like False, 0, "".
     for k, v in value.items():
-        if serialize_result := serialize(v):
-            serialized_dict.update({k: serialize_result})
+        serialize_result = serialize(v)
+        if serialize_result is not None:
+            serialized_dict[k] = serialize_result
     return serialized_dict
 
 
@@ -555,8 +557,10 @@ def _serialize_list(value: List) -> list:
         list: The serialized list
     """
     serialized_list = []
+    # Drop only Unassigned/None; preserve valid falsy values like False, 0, "".
     for v in value:
-        if serialize_result := serialize(v):
+        serialize_result = serialize(v)
+        if serialize_result is not None:
             serialized_list.append(serialize_result)
     return serialized_list
 

sagemaker-core/tests/unit/generated/test_utils.py

@@ -353,6 +353,20 @@ def test_serialize_method_returns_correct_data():
     assert serialized_data["S3Uri"] == "s3/uri"
 
 
+def test_serialize_preserves_falsy_dict_values():
+    # Regression: previously False / 0 / "" were stripped along with None.
+    assert serialize({"k": False}) == {"k": False}
+    assert serialize({"k": 0}) == {"k": 0}
+    assert serialize({"k": ""}) == {"k": ""}
+    assert serialize({"k": None}) == {}
+    assert serialize({"k": Unassigned()}) == {}
+
+
+def test_serialize_preserves_falsy_list_values():
+    assert serialize([False, 0, ""]) == [False, 0, ""]
+    assert serialize([None, "x", Unassigned(), 1]) == ["x", 1]
+
+
 def test_serialize_method_nested_shape():
     trial_component_parameters = {
         "test_num_value": TrialComponentParameterValue(number_value=1),