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sub new {
    my ($class, $initial_int) = @_;;
    my $scalar = 0+($initial_int // 0);
    return bless \$scalar, $class;
}

sub new {
    my ($class, $args) = @_;
...
    $args //= {};
    return bless $args, $class;
}

my $o = Foo->new(0);
${$o}++; # dereference $o, then increment the value of the scalar that
+ the scalar reference in $o points to.

# Because the dereferencing sigil binds more closely than the postincr
+ement operator, you can also do this:
$$o++; # dereference $o, then increment the value of the scalar that t
+he scalar reference in $o points to.