[swift-users] Foundation on Linux `CFBooleanGetTypeID`/`CFGetTypeID`

[Ryan Lovelett via swift-users]

I am trying to run some Swift code that relies on Foundation on Linux
(it is thoughtbot's Argo library if anyone wants to know the exact
code).

There is a fairly simple extension to NSNumber that looks like:

import Foundation

extension NSNumber {
  var isBool: Bool {
    return CFBooleanGetTypeID() == CFGetTypeID(self)
  }
}

However it seems that Foundation on Linux has neither
`CFBooleanGetTypeID` or `CFGetTypeID`.

Is this expected?
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