MX::AttributeShortcuts -- now with Moo-style type constraints

I just released MooseX::AttributeShortcuts 0.028; it incorporates Moo-style type constraints.

…largely because I needed to relax, and wrote MooseX::Meta::TypeConstraint::Mooish :)

That means you can now pass a coderef to has() in isa that, like with Moo, dies on validation failure and lives on validation success:

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# easiest is via AttributeShortcuts
use MooseX::AttributeShortcuts 0.028;

has foo => (
  is => 'rw',
  # $_[0] == the value to be validated
  isa => sub { die unless $_[0] == 5 },
);