Issue Description:

Description:

The rawValue enum initializer does not fail as designed for enums imported from Objective-C when given an invalid value. It does however fail for enums that are Objective-C compatible or exported to Objective-C.

import Foundation

@objc
enum test: Int{
  case a = 0
  case b
}

let failtest = test(rawValue: -1)
assert(failtest == nil)

let failtest2 = NSRoundingMode(rawValue: UInt.max)
assert(failtest2 == nil)

Expected result:

code should succeed

Actual Result:

assert is triggered, testVal has a value of UInt.max

Notes:

This may be design behavior due to the fact that many imported NS_OPTIONS need this behavior. In order to maintain compatibility a second failIfInvalid:Bool parameter that defaults to false could be added to the generated init