// .NET, .NET Standard 2.0
constructor(as: string; ai: int64; aprevRune: Int64)
// Island
constructor(as: string; ai: int64; aprevRune: int)

// .NET, .NET Standard 2.0
Reader(string as, int64 ai, Int64 aprevRune)
// Island
Reader(string as, int64 ai, int aprevRune)

// .NET, .NET Standard 2.0
init(_ as: string, _ ai: int64, _ aprevRune: Int64)
// Island
init(_ as: string, _ ai: int64, _ aprevRune: int)

// .NET, .NET Standard 2.0
Sub New(as As string, ai As int64, aprevRune As Int64)
// Island
Sub New(as As string, ai As int64, aprevRune As int)

method Read(b: Slice<Byte>): tuple of (n: Int64, err: error)

(Int64 n, error err) Read(Slice<Byte> b)

func Read(_ b: Slice<Byte>) -> tuple of (Int64, error)

func Read(b Slice<Byte>) tuple of (|name=n| Int64, |name=err| error)

Function Read(b As Slice<Byte>) As Tuple (Of Int64, error)

method ReadByte: tuple of (Byte, error)

func ReadByte() -> tuple of (Byte, error)

func ReadByte() tuple of (Byte, error)

Function ReadByte() As Tuple (Of Byte, error)

func UnreadByte() -> error

Function UnreadByte() As error