fix Pydantic v1 Union type coercion

Author: agarctfi

airbyte_cdk/sources/declarative/parsers/model_to_component_factory.py

@@ -1554,14 +1554,18 @@ def create_concurrent_cursor_from_incrementing_count_cursor(
                 f"Expected {model_type.__name__} component, but received {incrementing_count_cursor_model.__class__.__name__}"
             )
 
-        interpolated_start_value = (
-            InterpolatedString.create(
-                incrementing_count_cursor_model.start_value,  # type: ignore
+        start_value: Union[int, str, None] = incrementing_count_cursor_model.start_value
+        # Pydantic Union type coercion can convert int 0 to string '0' depending on Union order.
+        # We need to handle both int and str representations of numeric values.
+        # Evaluate the InterpolatedString and convert to int for the ConcurrentCursor.
+        if start_value is not None:
+            interpolated_start_value = InterpolatedString.create(
+                str(start_value),  # Ensure we pass a string to InterpolatedString.create
                 parameters=incrementing_count_cursor_model.parameters or {},
             )
-            if incrementing_count_cursor_model.start_value
-            else 0
-        )
+            evaluated_start_value: int = int(interpolated_start_value.eval(config=config))
+        else:
+            evaluated_start_value = 0
 
         cursor_field = self._get_catalog_defined_cursor_field(
             stream_name=stream_name,
@@ -1593,7 +1597,7 @@ def create_concurrent_cursor_from_incrementing_count_cursor(
             connector_state_converter=connector_state_converter,
             cursor_field=cursor_field,
             slice_boundary_fields=None,
-            start=interpolated_start_value,  # type: ignore  # Having issues w/ inspection for GapType and CursorValueType as shown in existing tests. Confirmed functionality is working in practice
+            start=evaluated_start_value,
             end_provider=connector_state_converter.get_end_provider(),  # type: ignore  # Having issues w/ inspection for GapType and CursorValueType as shown in existing tests. Confirmed functionality is working in practice
         )