[SR-1464] NSNumber.description is not compatible between OS X and linux

[norio-nomura]

Previous ID	SR-1464
Radar	None
Original Reporter	@norio-nomura
Type	Bug
Status	Resolved
Resolution	Done

Environment

swift-DEVELOPMENT-SNAPSHOT-2016-05-09-a
OS X 10.11.4 (15E65)
Ubuntu 14.04

Additional Detail from JIRA

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

md5: 60bfdbad742f50ecf9595cbf5c19db84

Issue Description:

Using swift-DEVELOPMENT-SNAPSHOT-2016-05-09-a.
On OS X:

Welcome to Apple Swift version 3.0-dev (LLVM dffa09ffd8, Clang 9f0d189820, Swift 1c720b8f84). Type :help for assistance.
  1> import Foundation 
  2> let n = NSNumber(value: 0.001) 
n: NSNumber = Double(0.001)
  3> n.description 
$R0: String = "0.001"
  4>  

On Ubuntu 14.04:

Welcome to Swift version 3.0-dev (LLVM dffa09ffd8, Clang 9f0d189820, Swift 1c720b8f84). Type :help for assistance.
  1> import Foundation
  2> let n = NSNumber(value:0.001)
n: Foundation.NSNumber = {
  Foundation.NSValue = {
    Foundation.NSObject = {}
  }
  _base = {
    info = 5766
    pad = 0
  }
  _pad = 4562254508917369340
}
  3> n.description
$R0: String = ".001"
  4>  

OS X: "0.001"
Linux: ".001"

[phausler]

On Darwin the objc behavior is based on `-[NSString initWithFormat:locale:]` for NSNumber.

objCType	format
B, c	@"%d"
C	@"%u"
s	@"%hi"
S	@"%hu"
i	@"%d"
I	@"%u"
l	@"%ld"
L	@"%lu"
f	@"%0.7g"
d	@"%0.16g"
q	@"%lld"
Q	@"%llu"

[Dante-Broggi]

Is this resolved? If so, this should be closed.

[norio-nomura]

Still exists on Swift 4.2

$ docker run --privileged -it --rm norionomura/swift:42 swift
Welcome to Swift version 4.2 (swift-4.2-RELEASE). Type :help for assistance.
  1> import Foundation
  2> let n = NSNumber(value: 0.001) 
n: Foundation.NSNumber = {
  Foundation.NSValue = {
    Foundation.NSObject = {}
  }
  _base = {
    info = 832702464
    pad = 8388596
  }
  _pad = 36028746312058880
}
  3> n.description
$R0: String = ".001"
  4>  

[spevans]

#1724

[spevans]

This should be fixed now

$ cat sr_1464.swift 
import Foundation
let n = NSNumber(value:0.001)
print(n.description)

$ ~/swift-DEVELOPMENT-SNAPSHOT-2018-12-07-a-ubuntu18.04/usr/bin/swift sr_1464.swift 
0.001
$