Re: [whatwg/encoding] Half-width Katakana should be representable in ISO-2022-JP (#105)

Sorry for the confusion. It turned out that ICU's ISO-2022-JP converter  (and other converters used in browsers)  supports Halfwidth Katakana ("ESC ( I") in the spirit of 'be lenient in what you accept and be strict in what you emit'. For instance, it's explicitly commented in [ICU's ucnv2022.cpp](https://cs.chromium.org/chromium/src/third_party/icu/source/common/ucnv2022.cpp?rcl=b34251f8b762f8e2112a89c587855ca4297fed96&l=172)

```
 Note: The converter uses some leniency:
 - The escape sequence ESC ( I for half-width 7-bit Katakana is recognized in
    all versions, not just JIS7 and JIS8.
.....
static const uint16_t jpCharsetMasks[MAX_JA_VERSION+1]={
    CSM(ASCII)|CSM(JISX201)|CSM(JISX208)|CSM(HWKANA_7BIT),  <== ISO-2022-JP version 0 still has HWKANA_7BIT
```

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