I guess that you've heard about p5-mop by now.

Moose into the core of Perl. Moose provides a Meta Object Protocol (MOP) to Perl. So does p5-mop, however p5-mop is implemented in a way that it can be properly included in the Perl core.

Keep in mind that p5-mop goal is to implement a subset of Moose. As Stevan Little says:

We are not putting "Moose into the core" because Moose is too opinionated, instead we want to put a minimal and l…