The C<SvREFCNT_inc()> and C<SvREFCNT_dec()> functions have been
removed and C<SvREFCNT()> will now work on non-scalars. [perl #117793]
+C<Dump> now checks its arguments at compile time. Both arguments are now
+evaluated in scalar context, with exceptions for @arrays and %hashes,
+allowing aggregates to be dumped directly. The first argument is evaluated
+in rvalue scalar context, allowing rvalue C<pos> and C<substr> to be
+dumped.
+
C<fill_mstats> no longer crashes if its argument is not already a string.
[perl #92260]