Another late addition from a previous idea: bring some functionality from Scalar::Util into core ref by having the latter return, in list context, respectively: REF, ADDR, BLESSED, where
- REF would be ref()'s current output if the reference is not blessed, and if it is then the same as if it were not,
- ADDR the same as refaddr()'s and
- BLESSED the package the reference is blessed in, if it is, or undef otherwise.
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