That's not an easy question to answer when
dealing with complex objects, because they can
contain refrences to other objects (which might
be shared between two or more obejcts you cache).
The only way to get the info you really want,
is to know how you are caching it -- if you are
just storing it in memory, then the garbage
collector is going to make sure that your object,
and any other object it refrences stays arround.
So what you need to do a complete traversal of
all refrences in your object. If you are using
something like Data::Dumper, or Storable, then
it depends on how you use those libraries --
either way the safest way to know exactly how
big it is, is to cache it to a file, and then
check the file size.
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