Thanks,

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 <[email protected]>:
> 
> 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 
> <[email protected] <mailto:[email protected]>> 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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