[swift-users] Different behaviour when casting Float and Double to NSNumber

Lars-Jørgen Kristiansen larsjk.84 at gmail.com
Wed Oct 5 06:54:16 CDT 2016


Will file a bug. 
Not sure how the library uses the NSNumber since it's closed source. So it might be other inconsistencies as well..

> 5. okt. 2016 kl. 13.50 skrev Zhao Xin <owenzx at gmail.com>:
> I think you should file a bug on the inconsistence of `description`. However, the third-party API somehow using the `description` is not a good idea.
> Zhaoxin
> On Wed, Oct 5, 2016 at 5:30 PM, Lars-Jørgen Kristiansen via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
> I'm working with a third party API for some external hardware. One of the functions takes a NSNumber, and it fails to interact correctly with the hardware if I cast a Float too NSNumber, but works as expected if I use Double..
> I dont know if it is related to NSNumber.stringValue since I dont know what the third part lib does with the NSNumber, but I noticed this:
> let float = 100_000_00 as Float
> let floatNumber = float as NSNumber
> let double = 100_000_00 as Double
> let doubleNumer = double as NSNumber
> hardware.doThing(number: floatNumber as NSNumber) // Hardware does not work
> hardware.doThing(number: doubleNumer as NSNumber) // Hardware works
> // Also noticed this:
> "\(floatNumber)" // "1e+07"
> "\(doubleNumer)" // "10000000"
> Is this expected behaviour?
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