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

[Zhao Xin]

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> 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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