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5.8.5 linux  <                    => unix perlio
5.8.5 linux  <            binmode => unix perlio
...
5.8.6 win32  <            binmode => unix        crlf
5.8.6 win32  <:raw                => unix 
5.8.6 win32  <:raw:perlio         => unix perlio

$ perl -v
This is perl, v5.8.5 built for i386-linux-thread-multi
...
$ perl -MPerlIO -le 'open IN, "<:raw:perlio" ,"a.txt";             pri
+nt for PerlIO::get_layers(IN)'
unix
perlio

$ perl -v
This is perl, v5.8.6 built for darwin-thread-multi-2level
...
$ perl -MPerlIO -le 'open IN, "<:raw:perlio" ,"a.txt";             pri
+nt for PerlIO::get_layers(IN)'
unix
perlio