Why did you post this as an update instead of replying to my node? I would have told you earlier that my solution does no copying.
Right on both counts, of course! I'm very sorry for not replying to your node; I was overwhelmed by the number of replies and the subtleties that came up as I tried to test them against my (un- and under-stated) expectations, and so went the lazy way of just updating the main post rather than replying to everyone individually.
It was this line:
alias my $temp = $$xr;
skimmed quickly, that made me think that there was copying, because I'm not familiar with the semantics of Data::Alias; I'm sorry for misunderstanding, and I will update my update accordingly.
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