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[SR-15627] String(describing:) does not correctly handle Bool wrapped in NSNumber #57923

sindresorhus opened this issue Dec 20, 2021 · 0 comments


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@sindresorhus sindresorhus commented Dec 20, 2021

Previous ID SR-15627
Radar None
Original Reporter @sindresorhus
Type Bug

Swift 5.5

Xcode 13.2.1

macOS 12.1

Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Bug
Assignee None
Priority Medium

md5: a3c7c78c5651e5eb010deee760cefe10

Issue Description:

String(describing: NSNumber(true))
//=> "1"

I expected it to print:


Possible solution: Internally, String(describing:​) can first check if the value is NSNumber and if so, do this comparison to check if the underlying value is a Bool:

nsNumber == kCFBooleanTrue || nsNumber == kCFBooleanFalse

Lack of this makes debugging more difficult, and also makes it annoying to use JSONSerialization which return Bool values wrapped in NSNumber.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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