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Previously, only ">&" used to exempt the third open argument from
"strict subs":
use strict;
open my $fh1, ">&", STDOUT; # bareword allowed
open my $fh2, ">>&", STDOUT; # error: Bareword "STDOUT" not allowed
Now all dup modes (>&, >>&, <&, +>&, +>>&, +<&) allow bareword
filehandles.
Fixes #22464.
Previously, only ">&" was tested (and other modes didn't work). Now all 6 dup modes are tested (and 6 non-dup modes to verify that barewords are still disallowed otherwise).
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