switching off Perl's buffering (with $|=0)

The other way around. $| controls autoflush, the opposite of buffering.

$| = 1; # Autoflush on, buffering off.
$| = 0; # Autoflush off, buffering on.

$|++;   # $| = 1
$|--;   # $| = !$| (flip setting 0/1)
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