IIRC, it's because Devel::Size is not able to compute a real "size" for CV's. See the "Bugs" section of Devel::Size. It returns a minimum size, and throws a warning to let you know somethings not 100% accurate.

In reply to Re: Error(?): "CV isn't complete"? by benizi
in thread Error(?): "CV isn't complete"? by BrowserUk

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