docs: def find_ident(self, name):
          """
          Searches this module and **all** of its sub-modules for an
          identifier with name `name` in its list of exported
          identifiers according to `pydoc`. Note that unexported
          sub-modules are searched.
  
          A bare identifier (without `.` separators) will only be checked
          for in this module.
  
          The documentation object corresponding to the identifier is
          returned. If one cannot be found, then an instance of
          `External` is returned populated with the given identifier.
          """
          if name in self.refdoc:
              return self.refdoc[name]
          for module in self.submodules():
              o = module.find_ident(name)
              if not isinstance(o, External):
                  return o
          return External(name)