code: private UnicodeSet getEquivalentDecimals(String decimal, boolean strictParse) {
          UnicodeSet equivSet = UnicodeSet.EMPTY;
          if (strictParse) {
              if (strictDotEquivalents.contains(decimal)) {
                  equivSet = strictDotEquivalents;
              } else if (strictCommaEquivalents.contains(decimal)) {
                  equivSet = strictCommaEquivalents;
              }
          } else {
              if (dotEquivalents.contains(decimal)) {
                  equivSet = dotEquivalents;
              } else if (commaEquivalents.contains(decimal)) {
                  equivSet = commaEquivalents;
              }
          }
          return equivSet;
      }
docs: Returns a set of characters equivalent to the given desimal separator used for
  parsing number.  This method may return an empty set.