Cross reference Re: (MeowChow - tied local wierdness) Re3: Aliasing Variables.

If the docs in the Alias module are correct, that contradicts the way you are showing local implemented as

# localize
local $a= 42;
# works like:
my $saved= $a;
$a= undef;
$a= 42;

# restore
# works like
$a= $saved;
[download]

The docs in Alias imply that local will also restore a re-binding, e.g.

local $x;
*x= \$y;  # point the scalar slot to alias $y
#...
# $x goes back to pointing to its own slot when restoring.
[download]

If local worked by saving/restoring the slot, than this would be a natural consequence, but ties, blessing, etc. would not be preserved, and your sample code would not show what it does.

—John