that your attribute builder methods' names are prefixed with an underscore
to mark them private.
+=head1 WARNING
+
+B<VERY IMPORTANT:> Most L<Perl::Critic> Policies (including all the ones that
+ship with Perl::Critic> use pure static analysis -- they never compile nor
+execute any of the code that they analyze. However, this policy is very
+different. It actually attempts to compile your code and then compares the
+subroutines mentioned in your code to those found in the symbol table.
+Therefore you should B<not> use this Policy on any code that you do not trust,
+or may have undesirable side-effects at compile-time (such as connecting to the
+network or mutating files).
+
+For this Policy to work, all the modules included in your code must be
+installed locally, and must compile without error.
+
=cut