subversions may not have all the compatibility wrinkles ironed out
yet.
-=head2 Upgrading from 5.21.1 or earlier
+=head2 Upgrading from 5.21.3 or earlier
-B<Perl 5.21.4 may not be binary compatible with Perl 5.21.1 or
+B<Perl 5.21.4 may not be binary compatible with Perl 5.21.3 or
earlier Perl releases.> Perl modules having binary parts
(meaning that a C compiler is used) will have to be recompiled to be
used with 5.21.4. If you find you do need to rebuild an extension with