`Not_Assigned` category?

I’ve submitted this through http://www.unicode.org/reporting.html, but track it here since it affects this repository.

Both http://www.unicode.org/reports/tr18/#Categories as the latest draft of that document i.e. http://www.unicode.org/reports/tr18/proposed.html#Categories list the following example:

\p{General_Category = Not_Assigned}

However, Not_Assigned is not a valid General_Category name as per the table here: http://unicode.org/reports/tr44/#GC_Values_Table

Suggested fix: use Unassigned instead in the example.

\p{General_Category = Unassigned}

It would be easy enough to add a Not_Assigned alias but I’d rather not if this is indeed a mistake.

Unicode TR18 の General_Category の例を TR44 General_Category Values Table の有効な名前と比較し、リンクされたセクションを出発点として使用します。例が一貫して有効なカテゴリ名を使用しているか、Unicode の報告によってリポジトリの変更が不要であることが確認されれば完了です。