Henri Sivonen comments

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                                            Henri Sivonen

Potential Unsound: 1 out-of-bound read and 5 unaligned memory access.

> @RalfJung @YoshikiTakashima Thank you. The OOB case indeed materialized an OOB pointer though didn't dereference it. Fixed in #53 . I'm leaving this issue open to remind me to...

Ensure that the provider performs correct alias mapping for Traditional Chinese locales

CC @sffc

Ensure that the provider performs correct alias mapping for Traditional Chinese locales

For clarity: CLDR maps `yue-CN` and `yue-Hans` to `zh-Hans`, i.e. `zh-u-co-pinyin`.

Make Swedish default collation handling able to deal with CLDR 41 and with CLDL 42 or later

CC @sffc @robertbastian @echeran

Make Swedish default collation handling able to deal with CLDR 41 and with CLDL 42 or later

I think this is less about old version but about upcoming versions. (I'm assuming that ICU4X 1.0 will ship with Unicode 14.0 and CLDR 41.) I guess the simplest thing...

Provide a trie-based alternative to UnicodeSet

For the normalizer, #2221 makes more sense.

Ensure that collations that use the import mechanism instead of alias are properly deduplicated

CC @sffc

Ensure that the provider performs correct non-Chinese collation alias mapping

CC @sffc. Norwegian: #1963. Traditional Chinese: #1964.

Ensure that the provider performs correct non-Chinese collation alias mapping

Looks like these aliases exist as [JSON](https://github.com/unicode-org/icu/blob/main/icu4c/source/data/coll/LOCALE_DEPS.json).

HTML needs a mechaism for extending the parsing algorithm

Having site-supplied declarations that affect parsing would cause parsing actions at a distance that would be hard to connect in a sensible way to all entry points to parsing. (It...