docs: public Partial without(DateTimeFieldType fieldType) {
          int index = indexOf(fieldType);
          if (index != -1) {
              DateTimeFieldType[] newTypes = new DateTimeFieldType[size() - 1];
              int[] newValues = new int[size() - 1];
              System.arraycopy(iTypes, 0, newTypes, 0, index);
              System.arraycopy(iTypes, index + 1, newTypes, index, newTypes.length - index);
              System.arraycopy(iValues, 0, newValues, 0, index);
              System.arraycopy(iValues, index + 1, newValues, index, newValues.length - index);
              Partial newPartial = new Partial(iChronology, newTypes, newValues);
              iChronology.validate(newPartial, newValues);
              return newPartial;
          }
          return this;
      }