I mean , this is terminal problem , doesn't it ?
No. It looks similar but no. The problem, in a nutshell, if you use warn "$ARGV $_ " for PerlIO::get_layers(*ARGV) you can see ARGV doesn't get utf8 io layer, only STDIN gets them
$ perl ... utf8wobom.csv >bad
utf8wobom.csv unix at ...
utf8wobom.csv crlf at ...
$ perl ... < utf8wobom.csv >good
- unix at ...
- crlf at ...
- encoding(utf-8-strict) at ...
- utf8 at ...
In my non-utf terminal it shows
$ ls -loanh good bad
-rw-rw-rw- 1 0 115 2011-10-02 01:31 bad
-rw-rw-rw- 1 0 103 2011-10-02 01:31 good
$ diff good bad
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