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>> ref={foo: {x:42}} Object { foo: {…} } ... 42 >> ref['foo'][bar] 42
>> $ref={foo: {x:42}} Object { foo: {…} } >> $ref['foo'][$bar] 42
DB<3> $ref = {foo=> { x => 42 } } ... 42 DB<6> p $$ref{foo}{$bar} 42
DB<11> use experimental 'refaliasing'; \%ref = $ref DB<12> p $ref{foo}{$bar} 42
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