Fix handling of not attribute values inside sequences

Author: xrmx

opentelemetry-api/src/opentelemetry/attributes/__init__.py

@@ -157,9 +157,10 @@ def _clean_extended_attribute_value(
 
             element_type = type(element)
             if element_type not in _VALID_ATTR_VALUE_TYPES:
-                return _clean_extended_attribute_value(
+                element = _clean_extended_attribute_value(
                     element, max_len=max_len
                 )
+                element_type = type(element)
 
             # The type of the sequence must be homogeneous. The first non-None
             # element determines the type of the sequence

opentelemetry-api/tests/attributes/test_attributes.py

@@ -139,6 +139,8 @@ def test_clean_extended_attribute(self):
         # mappings
         self.assertValid({})
         self.assertValid({"k": "v"})
+        # mappings in sequences
+        self.assertValid([{"k": "v"}])
 
         # test keys
         self.assertValid("value", "key")