Weird discrepancy with ICU4X

[aumetra]

So, to set the scene here, I have a proptest between two libraries set up. One of the libraries uses unicode-normalization under the hood, the other icu_normalizer.

I expected that both output the same values, but my CI exploded at some point on the weird string "\u{11366}\u{113ce}".
When put through the NFC normalizer, you get two different outputs:

1. unicode-normalization: "\u{113ce}\u{11366}"
2. icu_normalizer: "\u{11366}\u{113ce}"

Just a fun little thing I thought I'd report since it's technically a correctness issue (I'm just not good enough with Unicode to determine whether it's an issue with ICU4X or this crate).

[aumetra]

One more. I don't know why proptest suddenly finds so many:

Original: "\u{113c2}\u{113b8}"
unicode-normalization: "\u{113c7}"
icu_normalizer: "\u{113c2}\u{113b8}"

[Manishearth]

This crate hasn't been updated to Unicode 16.0 yet. Doing so is not super straightforward this time due to some of the newer characters having interesting combinations of properties.

[aumetra]

Ah, interesting. Thanks for the info! Good to know this is due to a new standard revision and not due to a bug