Re: [encoding] Clarify scope of document in preface (#10)

The general problem here is that forking and changing specs creates confusion and incompatibility.

If you're not changing the encoder then it's really helpful to make that clear by including it only informatively (where "helpful" is not a strong enough word). Then the world can know that existing encoders built on 10646 don't need to be rebuilt and are intended to remain compatible.

If I've understood correctly you're not really changing the decoder model either, just restricting and clarifying the error model and including a reference algorithm. In that case the delta relative to 10646 needs to be included too.

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