I don't tend to follow them either, but I've been frustrated by the lack of progress on allocator_api, and I came across this yesterday after looking into that.

I don't tend to follow them either, but I've been frustrated by the lack of progress on allocator_api, and I came across this yesterday after looking into that. I only mention it because the Handle stuff in there looked tangentially related, though it's talking about something quite a bit different than you were.