getBytes(_:maxLength:usedLength:encoding:options:range:remaining:)

func getBytes<R>(_ buffer: inout [UInt8], maxLength maxBufferCount: Int, usedLength usedBufferCount: UnsafeMutablePointer<Int>, encoding: String.Encoding, options: String.EncodingConversionOptions = [], range: R, remaining leftover: UnsafeMutablePointer<Range<Self.Index>>) -> Bool where R : RangeExpression, R.Bound == String.Index