docs: public final String prn(final Map<String, Object> pRqVs,
      final BigDecimal pVal) {
      return this.srvNumberToString.print(pVal.toString(),
        (String) pRqVs.get("decSepv"), //user's preferences
          (String) pRqVs.get("decGrSepv"),
            (Integer) pRqVs.get("priceDp"),
              (Integer) pRqVs.get("digInGr"));
    }