static <K extends @Nullable Object, V extends @Nullable Object> ValueEntry<K, V> newHeader() {
      return new ValueEntry<>(null, null, 0, null);
    }

    boolean matchesValue(@CheckForNull Object v, int smearedVHash) {
      return smearedValueHash == smearedVHash && Objects.equal(getValue(), v);
    }

    @Override
    public ValueSetLink<K, V> getPredecessorInValueSet() {