sub _decode_string {
  my $pos = pos;
  # Extract string with escaped characters
  m!\G((?:(?:[^\x00-\x1f\\"]|\\(?:["\\/bfnrt]|u[0-9a-fA-F]{4})){0,32766})*)!gc; # segfault under 5.8.x in t/20-mojo-json.t #83
  my $str = $1;