Looks like it has been fixed: 
$ perl -e 'print -t'
1
$ perl -e 'print -t' < /etc/passwd

$ perl -v

This is perl, v5.8.2 built for cygwin-thread-multi-64int
...

[download]

In reply to Re^2: Detecting interactive/non-interactive shell by Anonymous Monk
in thread Detecting interactive/non-interactive shell by kosun

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