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  . 'syswrite(STDOUT, $buf); syswrite(STDERR, $buf)}'
);

#--------------------------------------------------------------------------#
# filehandle manipulation
#--------------------------------------------------------------------------#

sub _relayer {
  my ($fh, $layers) = @_;
  # _debug("# requested layers (@{$layers}) for @{[fileno $fh]}\n");
  my %seen = ( unix => 1, perlio => 1 ); # filter these out
  my @unique = grep { !$seen{$_}++ } @$layers;
  # _debug("# applying unique layers (@unique) to @{[fileno $fh]}\n");
  binmode($fh, join(":", ":raw", @unique));
}

sub _name {
  my $glob = shift;
  no strict 'refs'; ## no critic
  return *{$glob}{NAME};
}