OK, here is the results of my testing:

#Works
local *LOG;
open(LOG, '>>test.out');
openTee(*STDOUT, *STDOUT, *LOG); 

#Does not work
my $fh = IO::File->new(">>test.out");
openTee(*STDOUT, *STDOUT, *$fh);

#Does not work
open(my $fh, '>>', 'test.out');
openTee(*STDOUT, *STDOUT, *$fh);

#Does not work
open(my $fh, '>>', 'test.out');
openTee(*STDOUT, *STDOUT, *$fh);

#Works
openTee(*STDOUT, *STDOUT, '>>test.out');

#Works
openTee(*STDOUT, *STDOUT, 'test.out');
[download]

Note the resason I am using IO::File is because actually I want to use IO::File->new_tmpfile, but as that doesn't work I am trying IO::File->new to make testing easier. Note the only reason I was trying to get new_tmpfile working was cause I couldn't get it into a string using scalar I/O

open($fh, "+<", \$string);
[download]

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