Add or improve specification for vertical fallback in UTS 35

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I wrote this doc on how to perform vertical fallback and implemented it in ICU4X. We should migrate this doc to a section in UTS 35.

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Mark Davis
February 23, 2023 at 9:41 PM

done

Shane Carr
February 23, 2023 at 9:38 PM

PR up: https://github.com/unicode-org/cldr/pull/2746

The ticket needs to be Accepted before I can merge the PR

Shane Carr
August 26, 2022 at 2:28 AM

The one in my doc handles extension keywords, and it front-loads a normalization step. I haven’t thought through fully whether the two algorithms produce the same results despite the differences in expressing them.

Rich Gillam
August 26, 2022 at 1:04 AM

It sounds like we need to reconcile them, then. How different are they? And should I go ahead with what I have for ICU 72 and then change it for ICU 73?

Shane Carr
August 26, 2022 at 1:00 AM

The algorithm I’ve implemented in ICU4X, which is the doc linked in the description in this ticket, is similar to, but not exactly the same as, the one in https://unicode-org.atlassian.net/browse/CLDR-15265

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Created July 25, 2022 at 7:26 PM
Updated April 5, 2023 at 3:34 AM
Resolved March 28, 2023 at 6:39 PM