From @bbkr

There was socket behavior change between 2012.11 and 2012.12.

For example sending euro sign through sockets

perl6 -e 'my $listener = IO​::Socket​::INET.new( localhost => "", localport => 8080, :listen ); while my $connection = $listener.accept( ) { $connection.send( "\x[20ac]\r\n" ); $connection.close( ); }'

On 2012.11 works
perl6 -e 'my $client = IO​::Socket​::INET.new( host => "localhost", port => 8080 ); my $inc = $client.get; say $inc.uc'
�

On 2012.12 breaks
perl6 -e 'my $client = IO​::Socket​::INET.new( host => "localhost", port => 8080 ); my $inc = $client.get; say $inc.uc'
Invalid operation on binary string
  in method uc at src/gen/CORE.setting​:2206
  in block at -e​:1

From @FROGGS

It works with latest commit by today.

The RT System itself - Status changed from 'new' to 'open'

@moritz - Status changed from 'open' to 'resolved'