public MultiExpression<T> filterResults(Predicate<T> accept) {
    return new MultiExpression<>(
      expressions.stream()
        .filter(entry -> accept.test(entry.result))
        .toList()
    );
  }
Returns a copy of this multi-expression, filtering-out the entry for each data value matching {@code accept}.
planetiler-core/src/main/java/com/onthegomap/planetiler/expression/MultiExpression.java