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  1. or download this
    my $type_constraint = Stopwatch->meta->get_attribute('timer')->type_co
+nstraint;
print $type_constraint->name; # prints DateTime
  2. or download this
    print $type_constraint->parent->name; # prints Object
print $type_constraint->parent->parent->name; # prints Ref
print $type_constraint->parent->parent->parent->name; # prints Any
  3. or download this
    subtype Protocol
    => as Str
    => where { /^HTTP\/[0-9]\.[0-9]$/ };
  4. or download this
    has 'protocol' => (isa => 'Protocol');