Intl BestFitMatcher by using ICU LocaleMatcher

Category: JavaScript
Type: No developer-visible change
Status: In developer trial (Behind a flag) (Chrome 93)
Intent stage: Prepare to ship

Summary

Use the ICU LocaleMatcher to implement the BestFitMatcher of ECMA402 in v8 JavaScript engine. ECMA402 defined the BestFitMatcher abstract operation to allow browser implementation to implement a better way to match locale data. UTS35 sec "4.4 Language Matching" details a data driven algorithm to use CLDR. ICU 67.1 (launched in April 2020) comes with an improved icu::LocaleMatcher API and implementation . This document shows how we implement v8's BestFitMatcher to use such API.

Standards & signals

Specification: https://tc39.es/ecma402/#sec-bestfitmatcher
Firefox: No signal
Safari: No signal
Web developers: No signals
Tracking bug: https://bugs.chromium.org/p/v8/issues/detail?id=7051

Docs: https://docs.google.com/document/d/1cPGfiihn76yj2iAomKcspPFyLLcnk3WkCiqceBQPQyk/edit#

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