docs: def incver(o, prop_names):
      """Increment the version numbers of a set of properties and return a new object"""
      from ambry.identity import ObjectNumber
  
      d = {}
  
      for p in o.__mapper__.attrs:
          v = getattr(o, p.key)
          if v is None:
              d[p.key] = None
          elif p.key in prop_names:
              d[p.key] = str(ObjectNumber.increment(v))
          else:
              if not hasattr(v, '__mapper__'): # Only copy values, never objects
                  d[p.key] = v
  
      return o.__class__(**d)