As I read the docs, the following code should report that the attribute does, Yes!, do Bool, instead of the No... it gives. 

BEGIN {
    package MyCow;
    use Moose; # or Mouse

    has "guernsey" =>
        is => "rw",
        isa => "Bool",
        ;
}

my $cow = MyCow->new;
$cow->guernsey(1);
print "How now, ",
    $cow->guernsey ? "brown" : "purple",
    " cow?", $/;

my $attr = $cow->meta->get_attribute("guernsey");
print "Attribute does Bool? ", $attr->does("Bool") ? "Yes!" : "No...",
+ $/;

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Do I just misunderstand? What is the right way to do this? I tried all the various names of the trait, like Moose::Meta::Attribute::Native::Trait::Bool.

In reply to Introspection of Moose/Mouse attributes fails to find native trait with `does` by Your Mother

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