Interesting ...
It appears like read-only values are not modified when aliased.
DB<123> sub tst { my $r = \ $_[0]; print ++$$r; }
DB<124> $x=3; for (1,2,$x) { tst($_); print ": ",$_,"\n" }
2: 1
3: 2
4: 4
UPDATE:
Seems to me like "aliasing" read-only values is falling back to "copying".
Or in other words: Only lvalues can be "really" aliased.
Which makes sense in a way, because the original value can't be changed anyway.
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