docs: private String nextQuotedValue(char quote) throws IOException {
      // Like nextNonWhitespace, this uses locals 'p' and 'l' to save inner-loop field access.
      char[] buffer = this.buffer;
      StringBuilder builder = new StringBuilder();
      while (true) {
        int p = pos;
        int l = limit;
        /* the index of the first character not yet appended to the builder. */
        int start = p;
        while (p < l) {
          int c = buffer[p++];
  
          if (c == quote) {
            pos = p;
            builder.append(buffer, start, p - start - 1);
            return builder.toString();
          } else if (c == '\\') {
            pos = p;
            builder.append(buffer, start, p - start - 1);
            builder.append(readEscapeCharacter());
            p = pos;
            l = limit;
            start = p;
          } else if (c == '\n') {
            lineNumber++;
            lineStart = p;
          }
        }
  
        builder.append(buffer, start, p - start);
        pos = p;
        if (!fillBuffer(1)) {
          throw syntaxError("Unterminated string");
        }
      }
    }