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	return !!1 if {
		'Type::API::Constraint'              => 1,
		'Type::API::Constraint::Constructor' => 1,
	}->{$role};
	"UNIVERSAL"->can("DOES") ? $proto->SUPER::DOES(@_) : $proto->isa(@_);
}

sub new { # Type::API::Constraint::Constructor
	my $class = ref($_[0]) ? ref(shift) : shift;
	my $self  = bless { @_ == 1 ? %{+shift} : @_ } => $class;
	
	$self->{constraint} ||= sub { !!1 };
	unless ($self->{name}) {
		require Carp;
		Carp::croak("Requires both `name` and `constraint`");
	}
	
	$self;
}