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# five UTF smiley faces (three bytes long each):
my $string = "\x{263a}\x{263a}\x{263a}\x{263a}\x{263a}";
my $bytes_written = syswrite($socket, $string, length $string);

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# five UTF smiley faces (three bytes long each):
my $string = "\x{263a}\x{263a}\x{263a}\x{263a}\x{263a}";
my $bytes_written = syswrite($socket, $string, size_in_bytes($string))
+;