That method of aliasing is interesting and occasionally useful, but it is hardly "The most general".

It's not limited to a scope like for and map aliasing. I did forget about glob aliasing.

my $y = do { local *temp = \$x; \our $temp };
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It's more general in its breadth of types of aliases it can create, but it can't create an array of aliases.

resulting in two entirely separate, unconnected arrays:

You seem to have misread what I wrote. I didn't say it aliased the arrays.