+=head2 mfn
+
+Returns current MFN position
+
+ my $mfn = $isis->mfn;
+
+=cut
+
+# This function should be simple return $self->{current_mfn},
+# but if new is called with _hack_mfn it becomes setter.
+# It's useful in tests when setting $isis->{record} directly
+
+sub mfn {
+ my $self = shift;
+ return $self->{current_mfn};
+};
+
+