Hi,

> What are the significance of the DataType memory size values. Is this the
> size of the value instance + the contained data or something else?

This is used to calculate the current cache size (in memory
representation). I know it's not an exact method, but it's not that
bad. It's almost impossible to calculate the "exact" number, specially
for shared objects (in the object cache).

> I assume you arrived at them experimentally.

Yes. Once I saw a way... now I found it. I will add a feature request for:

Improve object memory size calculation. Use constants for known VMs,
or use reflection to call
java.lang.instrument.Instrumentation.getObjectSize(Object
objectToSize)

Regards,
Thomas

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