docs: public boolean containsValue(final Object value)
      {
          final Object val = mapNullValue(value);
          boolean found = false;
          if (val != null)
          {
              final Object[] entries = this.entries;
              final int length = entries.length;
  
              for (int valueIndex = 1; valueIndex < length; valueIndex += 2)
              {
                  if (val == entries[valueIndex] || val.equals(entries[valueIndex]))
                  {
                      found = true;
                      break;
                  }
              }
          }
  
          return found;
      }