in reply to Using ":raw" layer in open() vs. calling binmode()

This is perl, v5.8.6 built for darwin-thread-multi-2level

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On my system the first two snippets return stdio instead of unix perlio. 
open (FH, '<:raw:perlio', '/dev/null');
print(PerlIO::get_layers(FH));          # --> unix perlio

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Does that work for you?

In Section Seekers of Perl Wisdom