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perluniprops: Discourage use of internal properties
These properties are publicly listed because they've always been listed.
I suspect, but haven't checked, that they pre-date the Unicode
properties that they are now equivalent to. They are therefore included
just for backwards compatibility. But new code shouldn't be using them,
unless it's trying to accept very old Unicode versions, so mark them in
the pod as discouraged. (That's the only effect, a pod change.)