code: private static void writeAscii(OutputAccessor out, CharSequence seq) {
  
          // We can use the _set methods as these not need to do any index checks and reference checks.
          // This is possible as we called ensureWritable(...) before.
          for (int i = 0; i < seq.length(); i++) {
              out.write((byte) seq.charAt(i));
          }
      }
docs: Fast-Path ASCII implementation.