Perl

Role up! Role up! (but keep hold of your Moose and make your meta immutable)

So what’s this immutable stuff all about? In short, it’s the Moose equivalent of

use strict;
use warnings;

Summary: Stick

__PACKAGE__->meta->make_immutable;

at the bottom of every Moose class unless you really know what you’re doing. It makes your code safer (and faster).

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