[DGD] My idea for the DGD driver - validate

[Robert Forshaw]

Something I forget to mention:

the 'validate' function will return zero by default. Therefore, any function 
that needs call_other permission has to be deliberately given it. And you 
can do 'validate validate_func() { }' to immediately isolate your object 
from call_other's. This makes it very hard to accidently give access to an 
object that you didn't mean to.

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