qr/\p{mypkg1::IsMyProperty}/i
with C</i> caseless matching, an explicit package name, and
-I<IsMYProperty> not defined at the time of the pattern compilation.
+I<IsMyProperty> not defined at the time of the pattern compilation.
+
+=item *
+
+Perl's memcpy(), memmove(), memset() and memcmp() fallbacks are now
+more compatible with the originals. [perl #127619]
=back