> perl -CDS

"D" corresponds to "i + o" whose documentation in perlrun states (emphasis mine):

> The "io" options mean that any subsequent open() (or similar I/O operations) in the current file scope will have the ":utf8" PerlIO layer implicitly applied to them, in other words, UTF-8 is expected from any input stream, and UTF-8 is produced to any output stream.

If you put the call to open into a module, it falls out of the current file scope.

The -C is intended for oneliners, in larger programs and modules, use binmode, explicit layers with 3-arg open, or open.pm.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re: The module version works, but the standlone version crashes with "Malformed UTF-8 character" by choroba
in thread The module version works, but the standlone version crashes with "Malformed UTF-8 character" by Perlfan52

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