code: public final String getCommaSeparatedArgumentNames(final int less) {
          final List<SgArgument> args = getArguments(less);
          return commaSeparated(args);
      }
docs: Returns the argument names from 0..(N+less) separated by a comma.
  
  @param less
  The number of arguments NOT to return from the end of the
  list. It's always a NEGATIVE value.
  
  @return Arguments without "less" arguments at the end of the list.