Re: [whatwg/url] ContextJ (RFC 5892) is Security Theater (Issue #776)

Something to consider before deciding whether to send feedback about UTS 46:

Even before getting to ContextJ, which affects U+200D from https://www.unicode.org/Public/emoji/16.0/emoji-zwj-sequences.txt , the mapping stage removes U+FE0F, which occurs in multiple sequences there.

That is, UTS 46 is incompatible with RGI emoji on a more fundamental level than ContextJ.

Making it not so would be very messy implementation-wise considering how the mapping and normalization works in both ICU4C and ICU4X, so asking for RGI emoji support in UTS 46 would be a big request.

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