code: def _update_data(self):
          
  
          func = self.owner.formula.func
          codeobj = func.__code__
          name = func.__name__  # self.cells.name   # func.__name__
          namespace_impl = self.owner._namespace_impl.get_updated()
          namespace = namespace_impl.interfaces
          selfnode = get_node(self.owner, None, None)
  
          for name in self.owner.formula.srcnames:
              if name in namespace_impl and isinstance(
                  namespace_impl[name], ReferenceImpl
              ):
                  refnode = get_node(namespace_impl[name], None, None)
                  self.owner.model.lexdep.add_path([selfnode, refnode])
  
          closure = func.__closure__  # None normally.
          if closure is not None:  # pytest fails without this.
              closure = create_closure(self.owner.interface)
  
          self.altfunc = FunctionType(
              codeobj, namespace, name=name, closure=closure
          )
docs: Update altfunc