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Returns a copy of +self+ that has ASCII-8BIT encoding;
the underlying bytes are not modified:
s = "\x99"
s.encoding # => #<Encoding:UTF-8>
t = s.b # => "\x99"
t.encoding # => #<Encoding:ASCII-8BIT>
s = "\u4095" # => "䂕"
s.encoding # => #<Encoding:UTF-8>
s.bytes # => [228, 130, 149]
t = s.b # => "\xE4\x82\x95"
t.encoding # => #<Encoding:ASCII-8BIT>
t.bytes # => [228, 130, 149]
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