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use strict;
use warnings;
...
)->on_done( sub { say "Listening on $PORT..." });

$loop-> run;

use strict;
use warnings;
...
    $sock-> close;
    select( undef, undef, undef, 0.01 );
}

...
1685    9       3df3726c030020e009      1248
...
1688    9       3df3726c030020e009      1248
Sereal: Error: Bad Sereal header: Not a valid Sereal document. at offs
+et 1 of input at srl_decoder.c line 573 at server.pl line 29.
1689    0