in reply to Test::Deep::noclass propagation

D'oh. 
cmp_deeply $o, noclass(subhashof({ a => ['b'], x => [any('y', 'z')] })
+);

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map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In Section Seekers of Perl Wisdom