Quoted explanation of the feature taken from this comment: https://www.reddit.com/r/Piracy/comments/j9blrl/biglybt_is_the_first_torrent_client_to_support/g8iyodd/
Though it doesn't seem like this side of the v2 spec is used automatically in clients supporting v2, but must be implemented in some way, if I understand this article correctly? https://torrentfreak.com/biglybt-is-the-first-torrent-client-to-support-the-bittorrent-v2-spec-201011/
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