Compact number formats for NumberFormatter

Originator:eidingermarco
Number:rdar://FB9950508 Date Originated:2022-03-08
Status:Open Resolved:
Product:Foundation Product Version:
Classification:Suggestion Reproducible:
 
The `Foundation` framework and its class `NumberFormatter` provide various styles (e.g. decimal, percent, scientific, spellOut or currency) but no compact style. A compact decimal number formatting would convert 1000 into 1K or 1100000 into 1.1M which is a common requirement for app developers.

A pull request containing a draft implementation: https://github.com/apple/swift-corelibs-foundation/pull/2710

It would be great if Foundation.NumberFormatter can provide handling for such compact styles out-of-the-box.

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