Intl.NumberFormat on Android with style: 'currency' and signDisplay: 'always' truncates currency sign for positive values

[stefan-schweiger]

Bug Description

When you use Intl.NumberFormat number with style: 'currency' and signDisplay: 'always' it works well enough for negative numbers, but as soon as you try it with a positive number it just removes the currency sign. See the code below.

This problem only occures on Android

This is not relevant as Intl doesn't work with JSC:

• I have run gradle clean and confirmed this bug does not occur with JSC

Hermes version: [email protected]
React Native version: 0.69.3
Platform: arm64-v8a

Steps To Reproduce

const App = () => {
  return (
    <View>
      <Text>
        {new Intl.NumberFormat('en-US', {style: 'currency', currency: 'EUR', signDisplay: 'always'}).format(100.32)}
        {'\n'}
        {new Intl.NumberFormat('en-US', {style: 'currency', currency: 'EUR', signDisplay: 'always'}).format(-100.32)}
        {'\n'}
        {new Intl.NumberFormat('en-US', {style: 'currency', currency: 'EUR', signDisplay: 'auto'}).format(100.32)}
        {'\n'}
        {new Intl.NumberFormat('en-US', {style: 'currency', currency: 'EUR', signDisplay: 'auto'}).format(-100.32)}
        {'\n'}

        {!!global.HermesInternal ? 'Hermes' : 'JSC'}
      </Text>
    </View>
  );
};
export default App;

Produces the following output on Android:

+100.32
-€100.32
€100.32
-€100.32

For iOS and Web it produces the correct output:

+€100.32
-€100.32
€100.32
-€100.32

The Expected Behavior

Intl.NumberFormat should produce the same output on each platform.

[dwatring]

Similarly, for android this configuration is also not consistent:

const App = () => {
  return (
    <View>
      <Text>
        {new Intl.NumberFormat('en-US', {style: 'percent', signDisplay: 'always'}).format(.32)}
        {'\n'}
        {new Intl.NumberFormat('en-US', {style: 'percent', signDisplay: 'always'}).format(-.32)}
        {'\n'}
        {new Intl.NumberFormat('en-US', {style: 'percent', signDisplay: 'auto'}).format(.32)}
        {'\n'}
        {new Intl.NumberFormat('en-US', {style: 'percent', signDisplay: 'auto'}).format(-.32)}
        {'\n'}

        {!!global.HermesInternal ? 'Hermes' : 'JSC'}
      </Text>
    </View>
  );
};
export default App;

Produces the following output on Android:

+32+
-32%
32%
-32%

For iOS and Web it produces the correct output:

+32%
-32%
32%
-32%

[Bi0max]

Having the same issue

[tiago138]

November 30, 2023 and I am running into the same problem.
:(

[shubhamguptadream11]

I had raised a PR to fix this: #1483