v0.8.0

Some additions in preparation for big integers.

GitHub

• #47 Req. nonzero bit width
• #43 Req. additional bit counts
• #34 Recoverable unsigned subtraction

New NBKBinaryInteger APIs

bitWidth >= 1

var nonzeroBitCount:     Int { get }
var leadingZeroBitCount: Int { get }
var mostSignificantBit: Bool { get }

New NBKUnsignedInteger APIs

func subtractingReportingOverflow(_ other: Self) -> PVO<Self>
mutating func subtractReportingOverflow(_ other: Self) -> Bool

func subtractingReportingOverflow(_ other: Digit) -> PVO<Self>
mutating func subtractReportingOverflow(_ other: Digit) -> Bool