This method overrides the parent to also install delegation methods.
+If, after installing all methods, the attribute object has no associated
+methods, it throws an error unless C<< is => 'bare' >> was passed to the
+attribute constructor. (Trying to add an attribute that has no associated
+methods is almost always an error.)
+
=item B<< $attr->remove_accessors >>
This method overrides the parent to also remove delegation methods.