docs: def filter_any_above_threshold(
              self,
              multi_key_fn,
              value_dict,
              threshold,
              default_value=0.0):
          """Like filter_above_threshold but `multi_key_fn` returns multiple
          keys and the element is kept if any of them have a value above
          the given threshold.
  
          Parameters
          ----------
          multi_key_fn : callable
              Given an element of this collection, returns multiple keys
              into `value_dict`
  
          value_dict : dict
              Dict from keys returned by `extract_key_fn` to float values
  
          threshold : float
              Only keep elements whose value in `value_dict` is above this
              threshold.
  
          default_value : float
              Value to use for elements whose key is not in `value_dict`
          """
          def filter_fn(x):
              for key in multi_key_fn(x):
                  value = value_dict.get(key, default_value)
                  if value > threshold:
                      return True
              return False
          return self.filter(filter_fn)