Re: [whatwg/encoding] ISO 2022-jp encoding/decoding support (#60)

> Two decode expectations for malformed sequences seem wrong:
> Fail escape start: 1B 65 79 56 1B 28 42 assert_equals: expected "�eByV" but got "�eyV"
> Fail escape: 1B 24 65 79 56 1B 28 42 assert_equals: expected "�e$yV" but got "�$eyV"

@hsivonen @annevk  i fixed the first, which was indeed a bug. (Wrong expectations.)
however the second test you mention above still fails in FF, Chrome and Safari.

I suspect it may be a bug in the decoder algorithm at https://encoding.spec.whatwg.org/#iso-2022-jp-decoder

step escape.8 says:

> Prepend lead and byte to stream.

To get what the browsers are actually returning, i think it needs to say
"Prepend byte and lead to stream"

Or perhaps better, specify explicitly the order in which those two should end up when prepended. 

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