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# Converts $s to use the UTF8=1 storage format if it's not already.
utf8::upgrade($s);
...
# Converts $s to use the UTF8=0 storage format if it's not already.
# Returns false if it can't.
utf8::downgrade($s, 1);

# From Unicode to UTF-8:
utf8::encode($s);
...
utf8::decode(my $uni = $utf8);
use Encode qw( decode ); my $uni = decode('UTF-8', $utf8);
use Encode qw( decode_utf8 ); my $uni = decode_utf8($utf8);