docs: public StringBuilder appendTo(StringBuilder buf, VectorFieldTypeInformation<BitVector> meta) {
      this.antecedent.appendTo(buf, meta);
      buf.append(" --> ");
      this.consequent.appendItemsTo(buf, meta);
      buf.append(": ");
      buf.append(union.getSupport());
      buf.append(" : ");
      buf.append(this.measure);
      return buf;
    }