=head2 mk_group_accessors
+ __PACKAGE__->mk_group_accessors(simple => 'hair_length');
+
=over 4
=item Arguments: $group, @fieldspec
=head2 mk_group_ro_accessors
+ __PACKAGE__->mk_group_ro_accessors(simple => 'birthdate');
+
=over 4
=item Arguments: $group, @fieldspec
=head2 mk_group_wo_accessors
+ __PACKAGE__->mk_group_wo_accessors(simple => 'lie');
+
=over 4
=item Arguments: $group, @fieldspec
=head2 make_group_accessor
+ __PACKAGE__->make_group_accessor(simple => 'hair_length', 'hair_length');
+
=over 4
=item Arguments: $group, $field, $method
=head2 make_group_ro_accessor
+ __PACKAGE__->make_group_ro_accessor(simple => 'birthdate', 'birthdate');
+
=over 4
=item Arguments: $group, $field, $method
=head2 make_group_wo_accessor
+ __PACKAGE__->make_group_wo_accessor(simple => 'lie', 'lie');
+
=over 4
=item Arguments: $group, $field, $method