code: private void evalSelect(MessageArg arg) {
      tag.skip(COMMA_WS);
      int pos = -1;
      int end = -1;
      String value = arg.asString();
      while (tag.peek() != Chars.EOF) {
        if (!tag.seek(NON_WS, choice)) {
          break;
        }
        
        String token = choice.token().toString();
        tag.jump(choice);
        tag.skip(COMMA_WS);
        if (!tag.seekBounds(choice, '{', '}')) {
          break;
        }
        
        if (token.equals(value)) {
          recurse(choice, value);
          return;
        } else if (token.equals("other")) {
          pos = choice.pos;
          end = choice.end;
        } else {
          tag.jump(choice);
          tag.skip(COMMA_WS);
        }
      }
  
      // Evaluate the "other" tag if nothing matched.
      if (pos != -1 && end != -1) {
        choice.set(pos, end);
        recurse(choice, value);
      }
    }
docs: SELECT - Evaluate the tag that matches the argument's value.