# Original code
$self->{'Post'} = ($args{'Post'} or sub {1;});

# High precedence or
$self->{'Post'} = $args{'Post'} || sub {1};

# Ternary operator
$self->{'Post'} = $args{'Post'} ? $args{'Post') : sub {1};

# Using '||' for a numeric value.
$self->{'Number'} = $args{'Number'} || 10;