[SR-13952] Nil value from Number Formatter

[swift-ci]

Previous ID	SR-13952
Radar	rdar://problem/72183860
Original Reporter	dimitri.strauneanu (JIRA User)
Type	Bug

Environment

Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial

Swift version 5.3.1 (swift-5.3.1-RELEASE)
Target: x86_64-unknown-linux-gnu

Additional Detail from JIRA

Votes	1
Component/s	Foundation
Labels	Bug, ICU, Linux
Assignee	None
Priority	Medium

md5: e9e8d7e301b891b7980c160325f3757c

Issue Description:

Running the following code gives different results for MacOS and Ubuntu 16.04.

let identifier = "en_RO"
let price = "99,55"

let formatter = NumberFormatter()
formatter.locale = Locale(identifier: identifier)
formatter.numberStyle = .decimal
formatter.maximumFractionDigits = 2

print(String(describing: formatter.number(from: price)))

MacOS with Swift version:
Apple Swift version 5.2.4 (swiftlang-1103.0.32.9 clang-1103.0.32.53)
Target: x86_64-apple-darwin19.6.0
Output: {code:swift}Optional(99.55)

Ubuntu 16.04 with Swift version:
Swift version 5.3.1 (swift-5.3.1-RELEASE)
Target: x86_64-unknown-linux-gnu
Output: {code:swift}nil

[typesanitizer]

@swift-ci create

[swift-ci]

Comment by Dimitri Strauneanu (JIRA)

Any updates here? Is there any possible workaround for now? This is a real blocker.

[gwynne]

Confirmed this discrepancy also appears between Xcode 12.3 and the latest 5.3 Focal image:

$ swift
Welcome to Apple Swift version 5.3.2 (swiftlang-1200.0.45 clang-1200.0.32.28).
Type :help for assistance.
  1> import Foundation
  2> let identifier = "en_RO"
  3. let price = "99,55"
  4.
  5. let formatter = NumberFormatter()
  6. formatter.locale = Locale(identifier: identifier)
  7. formatter.numberStyle = .decimal
  8. formatter.maximumFractionDigits = 2
  9.
 10. print(String(describing: formatter.number(from: price)))
Optional(99.55)
 11> ^D
$ docker run -ti --rm --privileged swift:5.3-focal
root@e25849567a2d:/# swift
Welcome to Swift version 5.3.1 (swift-5.3.1-RELEASE).
Type :help for assistance.
  1> import Foundation
  2> let identifier = "en_RO"
  3. let price = "99,55"
  4.
  5. let formatter = NumberFormatter()
  6. formatter.locale = Locale(identifier: identifier)
  7. formatter.numberStyle = .decimal
  8. formatter.maximumFractionDigits = 2
  9.
 10. print(String(describing: formatter.number(from: price)))
nil

[gwynne]

Based on the results of querying the Locale object (the decimalSeparator and groupingSeparator properties), it looks like the locale data for en_RO is incorrect - is this possibly an issue in ICU?

[spevans]

It looks to be an ICU issue on Linux. The en_RO locale isnt in the list of available locales on Linux but is on macOS. Note that macOS uses a slightly different version of ICU, where Apple ship some local changes to the published versions. Linux uses the default publised versions.