Yes, today is my day for going through all the perldelta docs and learning all sorts of new things. Well anyway I was reading perl591delta and I read this:
The :unique attribute is only meaningful for globals

Now applying :unique to lexical variables and to subroutines will result in a compilation error.

But a search for unique attribute yields no information.

What exactly is this attribute and how does it work? And where could I have found docs on it?

Carter's compass: I know I'm on the right track when by deleting something, I'm adding functionality

In reply to What is the :unique attribute for package variables? by princepawn

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