[whatwg/encoding] Editorial: make ISO-2022-JP encoder perform error state switch (#236)

This way you can invoke its handler directly without going the process algorithm as is needed to fix #235. This also avoids the need for "prepend" in the "process" algorithm.

Additionally, this commit adds two clarifying asserts to the "process" algorithm documenting what error modes can be in effect when.


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  https://github.com/whatwg/encoding/pull/236

-- Commit Summary --

  * Editorial: make ISO-2022-JP encoder perform error state switch

-- File Changes --

    M encoding.bs (25)

-- Patch Links --

https://github.com/whatwg/encoding/pull/236.patch
https://github.com/whatwg/encoding/pull/236.diff

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