Intl.NumberFormat maximumFractionDigits not applying with currencyDisplay "name"

[tokkozhin]

Bug Description

• The issue is reproducible with the latest version of React Native.

Hermes git revision (if applicable):
React Native version: 81.5 (expo)
OS: iOS
Platform (most likely one of arm64-v8a, armeabi-v7a, x86, x86_64):

Steps To Reproduce

Run the code:

    const number = new Intl.NumberFormat('en-US', {
      style: "currency",
      currency: 'USD',
      currencyDisplay: "name",
      maximumFractionDigits: 0,
    });
    console.log(formatted.format(1));   ->   1.00 US dollars

The Expected Behavior

1 US dollar

[lavenzg]

You repro isn't runnable. And I don't see what's the problem? Hermes, v8 and JSC all give the same result.

[tokkozhin]

Sorry, I have corrected the code example. The problem still remains when - maximumFractionDigits: 0

[lavenzg]

I see. Now I can reproduce it. I looked into the code a bit. We are passing the correct config to Apple Platform API, but NSNumberFormatter doesn't respect maximumFractionDigits when the style is currencyPlural. Below is the swift code I tested:

import Foundation

let formatter = NumberFormatter()
formatter.numberStyle = .currencyPlural
formatter.locale = Locale(identifier: "en-US")
formatter.currencyCode = "USD"
formatter.usesSignificantDigits = false
formatter.minimumFractionDigits = 0
formatter.maximumFractionDigits = 0
if let s = formatter.string(from: 1.234) {
    print(s)
}