this controls the behavior of global destruction of objects and other
references. See L<perlhack/PERL_DESTRUCT_LEVEL> for more information.
+=item PERL_ENCODING
+
+If using the C<encoding> pragma without an explicit encoding name, the
+PERL_ENCODING environment variable is consulted for an encoding name.
+
=item PERL_ROOT (specific to the VMS port)
A translation concealed rooted logical name that contains perl and the