DOC: Add in-line comment on list test

unittests/test_issues.py

@@ -73,6 +73,8 @@ def test_issue_128():
     https://gitlab.com/linkahead/linkahead-pylib/-/issues/128.
 
     """
+    # Test assignement correct assignment for both datatype=DATETIME
+    # and datatype=LIST<DATETIME>, just to be sure.
     prop = db.Property(name="TestDatetime", datatype=db.DATETIME)
     prop_list = db.Property(name="TestListDatetime", datatype=db.LIST(db.DATETIME))