Release 3.0

• Minimum platform versions are now macOS 13.3, iOS 16.4, tvOS 16.4, and watchOS 9.4
• Swift 6 language mode support: package now uses tools version 6.0 and declares its minimum platforms
• Integer: Int64 fast paths for division, toPower(of:), sqrt, shifts, magnitude, bitSize and bitCount
• Arbitrary-length integer literals (let x: BigInt = 123456789012345678901234567890) are now supported for BigInt and Integer
• Fixed BigInt division by zero now traps, shifts past the word width, rounding of negative right shifts, random(below:) for small bounds, conversion from floating-point numbers, hashing of negative values, and parsing of empty/sign-only strings
• BigInt: faster division, string conversion (direct bit extraction for bases 2, 8, 16; divide and conquer for base 10), parsing, toPower(of:) and sqrt; octal output of large numbers was incorrect and is now fixed
• BigInt: new init?(_:radix:) and toString(radix:uppercase:) supporting radixes 2 to 36, LosslessStringConvertible conformance, extendedGCD, modInverse, modPow and isProbablePrime; decoding from JSON numbers; doubleValue is now correctly rounded
• Fixed overflow handling in Rational comparison, addition and subtraction
• Rational: faster multiplication, division and comparison
• toPower(of:) for fixed-width integers no longer overflows spuriously in its last step
• Rational: parsing supports arbitrarily large numerators and denominators (and rejects zero denominators); new rounded(_:) and reciprocal; doubleValue no longer overflows or loses precision for huge numerators and denominators
• Complex: division and reciprocal use Smith's algorithm; sqrt avoids cancellation; integral powers use repeated squaring; parsing via LosslessStringConvertible; conforms to SignedNumeric; exp of a real number no longer returns NaN on overflow
• Added a DocC catalogue, README examples, randomized tests against Int128, property tests for Complex, hashing, Sendable and Codable, and benchmarks