A MIME::Decoder subclass for the "binary" encoding (in other words,
The "binary" decoder is a special case, since its ill-advised
to read the input line-by-line: after all, an uncompressed image file might
conceivably have loooooooooong stretches of bytes without a "\n" among
them, and we dont want to risk blowing out our core. So, we
read-and-write fixed-size chunks.
Both the <B>encoderB> and <B>decoderB> do a simple pass-through of the data
from input to output.