docs: def find(self, func):
          """
          Return the first value which passes a truth test.
          Aliased as `detect`.
          """
          self.ftmp = None
  
          def test(value, index, list):
              if func(value, index, list) is True:
                  self.ftmp = value
                  return True
          self._clean.any(test)
          return self._wrap(self.ftmp)