use Mouse;
use Mouse::Util::TypeConstraints;
- subtype 'HeadersType' => as 'Object' => where { defined $_ && eval { $_->isa('Headers') } };
+ subtype 'HeadersType' => as 'Object' => where { $_->isa('Headers') };
coerce 'HeadersType' =>
from 'ScalarRef' => via {
Headers->new();