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my %map = (
    typeA => sub { $_[0]->{key1}[3]{key2} },
...
    typeC => sub { $_[0]->[1]{key4} },
    # ...
);

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$$obj{cost}  <--type1
$$obj{priceList}{price}  <--type2
$$obj{priceList}{price}{value}  <--type3
...etc..