/*
=for apidoc av_clear
-Frees the all the elements of an array, leaving it empty.
+Frees all the elements of an array, leaving it empty.
The XS equivalent of C<@array = ()>. See also L</av_undef>.
Note that it is possible that the actions of a destructor called directly
/*
=for apidoc hv_clear
-Frees the all the elements of a hash, leaving it empty.
+Frees all the elements of a hash, leaving it empty.
The XS equivalent of C<%hash = ()>. See also L</hv_undef>.
See L</av_clear> for a note about the hash possibly being invalid on