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$ cat funky_i_o.pl
use strict;
...
    print "We haz teh dataz! (", join(", ", @serial_data), ")\n";
    @serial_data = ();
}

Select or download this

$ perl funky_i_o.pl
We haz teh dataz! (0.947528113451884)
...

We haz teh dataz! (0.760059503593943)
Quitting!