ReadonlyX is a great option for this. Note that exists and defined both still autovivify any intermediate structures - e.g. if you are looking at $foo->{bar}{baz} then $foo will be autovivified to {bar => {}} regardless of what the end check is (the final element will not be vivified unless assigned to). Two options for avoiding this are autovivification and my Data::DeepAccess.
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ReadonlyX is a great option for this. Note that exists and defined both still autovivify any intermediate structures - e.g. if you are looking at
$foo->{bar}{baz}then$foowill be autovivified to{bar => {}}regardless of what the end check is (the final element will not be vivified unless assigned to). Two options for avoiding this are autovivification and my Data::DeepAccess.