I can confirm this: 
$ perl --version

This is perl, v5.8.8 built for i486-linux-gnu-thread-multi
...

$ perl -MPerlIO -e 'open($fh, "<", "/dev/null");
print join(", ", PerlIO::get_layers($fh)), "\n";'
unix, perlio
$ perl -MPerlIO -e 'open($fh, "<:raw", "/dev/null");
print join(", ", PerlIO::get_layers($fh)), "\n";'
unix
$ perl -MPerlIO -e 'open($fh, "<", "/dev/null");
binmode $fh;
print join(", ", PerlIO::get_layers($fh)), "\n";'
unix, perlio

[download]
Looks like a bug to me, since the behaviour appears to contradict the description in the docs (either a doc bug or a code bug).

For what it's worth, I tend to use the binmode $fh; variant, but that's a habit formed in pre-layer times.

In reply to Re: Using ":raw" layer in open() vs. calling binmode() by jbert
in thread Using ":raw" layer in open() vs. calling binmode() by Anonymous Monk

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