docs: public static String convertToUpperUnderscore(String ident) {
  
      ident = LEADING_OR_TRAILING_UNDERSCORE_PATTERN.matcher(ident).replaceAll("");
      ident = WORD_BOUNDARY_IN_IDENT_PATTERN.matcher(ident).replaceAll("_");
      ident = CONSECUTIVE_UNDERSCORES_PATTERN.matcher(ident).replaceAll("_");
      return Ascii.toUpperCase(ident);
    }