There are no encodings embodied in the Unicode standard. At least that's what I was told, and I don't see any myself. Feel free to point out where.
See section 3.9 in this PDF. This is a draft of Unicode 6.0, but this section has been in the Unicode standard for some time.

In reply to Re^11: Mugged by UTF8, this CANNOT be right by NodeReader
in thread Mugged by UTF8, this CANNOT be right by tosh

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