##
>> $ref={foo: {x:42}}
Object { foo: {…} }
>> $ref['foo'][$bar]
42
##
##
DB<3> $ref = {foo=> { x => 42 } }
DB<4> $bar = "x"
DB<5> p $ref->{foo}{$bar}
42
DB<6> p $$ref{foo}{$bar}
42
##
##
DB<11> use experimental 'refaliasing'; \%ref = $ref
DB<12> p $ref{foo}{$bar}
42