Max char limit on a tag
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Seems there is a tag char limit of 25 chars.
Also I think we should avoid tags like Q_SCRIPT_DECLARE_QMETAOBJECT
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There are no guidelines, but I don't think that it is a good tag too. Tag is some keyword to search for it. I really don't think someone will search for such tag. It is more suitable for text search, not for tag search.