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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