The encoding of the ip address as returned by remote_ip() is ASCII-8BIT,
and the encoding of the string literal '127.0.0.1' in rails 3.0.9 is
US-ASCII. You can demonstrate that by putting this in an action:
@remote_ip = request.remote_ip
@remote_ip_encoding = @remote_ip.encoding.name
@str_literal_encoding = '127.0.0.1'.encoding.name
and then displaying the variables in a view. ASCII-8BIT is a synonym
for 'binary', i.e. unknown encoding.
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