The Perl 5 module MooseX::InsideOut provides metaroles for inside-out
objects. That is, it sets up attribute slot storage somewhere other
than inside $self. This means that you can extend non-Moose classes,
whose internals you either don't want to care about or aren't
hash-based.

Homepage:
https://metacpan.org/release/MooseX-InsideOut
