Note initial addition of p5-Moose version 0.54 as
devel/p5-Moose into The NetBSD Packages Collection.

Moose is an extension of the Perl 5 object system.
The main goal of Moose is to make Perl 5 Object Oriented programming
easier, more consistent and less tedious. With Moose you can to
think more about what you want to do and less about the mechanics
of OOP.
Additionally, Moose is built on top of Class::MOP, which is a
metaclass system for Perl 5. This means that Moose not only makes
building normal Perl 5 objects better, but it provides the power
of metaclass programming as well.

(seb)