[whatwg/encoding] iso-2022-jp decoder, "trail byte" case says to prepend byte in the end of stream step (#164)

In the [iso-2022-jp decoder](https://encoding.spec.whatwg.org/#iso-2022-jp-decoder), in the "trail byte" case, when byte is "end of stream", the spec says to prepend the byte (which is end-of-stream) to the stream.  Am I misunderstanding ? If not why are we doing that ?

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