Missing ref() return possibility?

BrowserUk has asked for the wisdom of the Perl Monks concerning the following question:

Perlfunc lists the following possible return values from ref:

    SCALAR
    ARRAY
    HASH
    CODE
    REF
    GLOB
    LVALUE
[download]

Is that all of them? I've got a vague recollection of either encountering or seeing reference to a 'REGEX' type?

Any others?

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