code: public RoundingQueryBuilder setRoundingName(String roundingName) {
          Objects.requireNonNull(roundingName);
          set(RoundingQuery.KEY_QUERY_ROUNDING_NAME, roundingName);
          return this;
      }
docs: Sets the rounding names of the {@link MonetaryRounding} instances. This method allows to
  access the {@link MonetaryRounding} instances by passing a name, which most of the time
  identifies a certain rounding instance. Each entry is first matched as name on equality. If no instance
  with such a name exists, the value passed is interpreted as a regular
  expression to lookup roundings.
  
  @param roundingName the (custom) rounding name expression, not {@code null}.
  @return this instance for chaining