Note that "serializing" objects using Data::Dumper or YAML only work because they break encapsulation, and assume something about their implementation - for instance, that objects are implemented using a reference to a hash, and that the entire state of the object depends only on the content of said hash (or reference to an array, or scalar).
Serializing fly weigth objects or inside out objects will not work using Data::Dumper or YAML. You'll need to write your serialize/deserialize routines in (all) your classes.
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