Answer by Shubham Mishra for Swift casts Bool to NSNumber using 'as' operator

According to Apple documentation NSNumber can be initialized with following data type and hence can be typecasted into them as well:-

open class NSNumber : NSValue {        public init?(coder aDecoder: NSCoder)        public init(value: Int8)        public init(value: UInt8)        public init(value: Int16)        public init(value: UInt16)        public init(value: Int32)        public init(value: UInt32)        public init(value: Int64)        public init(value: UInt64)        public init(value: Float)        public init(value: Double)        public init(value: Bool)        @available(iOS 2.0, *)        public init(value: Int)        @available(iOS 2.0, *)        public init(value: UInt)        open var int8Value: Int8 { get }        open var uint8Value: UInt8 { get }        open var int16Value: Int16 { get }        open var uint16Value: UInt16 { get }        open var int32Value: Int32 { get }        open var uint32Value: UInt32 { get }        open var int64Value: Int64 { get }        open var uint64Value: UInt64 { get }        open var floatValue: Float { get }        open var doubleValue: Double { get }        open var boolValue: Bool { get }        @available(iOS 2.0, *)        open var intValue: Int { get }        @available(iOS 2.0, *)        open var uintValue: UInt { get }        open var stringValue: String { get }        open func compare(_ otherNumber: NSNumber) -> ComparisonResult        open func isEqual(to number: NSNumber) -> Bool        open func description(withLocale locale: Any?) -> String    }

So All of the following Examples are true:-

        let intValue : Int = 2        let floatValue : Float = 2.0        let boolValue : Bool = true        let doubleValue : Double = 2        let x = intValue as NSNumber        let y = floatValue as NSNumber        let z = boolValue as NSNumber        let a = doubleValue as NSNumber