This may prove useful to study:
my $x;
# unless overloaded, numeric values of two refs to the same thing are
+equal
{package X; use Carp; sub is_x { carp \$x == \$_[0] ? "ok" : "not ok"
+}}
X::is_x($x);
X::is_x(++$x);
X::is_x($x++);
X::is_x($x+0);
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