=end HTML
+=func CowREFCNT
+
+Get the copy-on-write (COW) reference count of a scalar, or C<undef> if the perl does not support scalar COW
+or if the scalar is not COW.
+
+See also L<B::COW/"cowrefcnt( PV )">.
+
+=for Pod::Coverage kdf_aes_transform_half
+
=cut