libinternals-perl - 1.1-4+b2 main

Internals allows you to write-protect and write-enable your Perl variables,
objects and data structures.
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Moreover, the reference count of any Perl variable can be read and set.
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You can never pass the object directly on which to perform the desired
action, you always have to pass a reference to the variable or data structure
in question.
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This comes in handy for objects and anonymous data structures, where you only
have a reference anyway!