Well, if you really died like this:
my %exception = (err => 42, str => 'My fault');
die \%exception;
then $@ would contain the hash reference. Since it seems to also include the text, I assume that you are throwing the error in a different way, stringifying the hash reference as you go along.
A better way to do this (if you want the error object to still work as a normal error message when not used as a hash ref) is to return a proper blessed object. That way you can use the overload.pm module to provide custom stringification, and also have access to your exception record.
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