[Encoding] false statement

"Historically encodings and their specifications (if any) were kept track of by the IANA Character Sets registry. This specification renders that registry obsolete."

This specification does not, by itself, cause any changes to the IANA Character Sets registry at all, much less render it obsolete.

I don't think the document should be published without documenting the interoperability issues between web applications that follow this spec and non-web applications that don't.

Larry
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http://larry.masinter.net