reading binary stream?

[Hiroki Horiuchi]

Hello.

This program
--
#!/usr/bin/env perl6

use v6;

my $h = open '/dev/urandom', :r;
loop (;;) {
  $h.getc;
}
--
spits an error below.
--
Malformed UTF-8 string

  in 'IO::getc' at line 5457:CORE.setting
  in main program body at line 7:./getc.p6
--
How can I fix the problem?

Thank you.
--
Hiroki Horiuchi