readAll (?bufsize:Int):Bytes
Available on  Neko, macOS, Linux, Windows
Read and return all available data.
The bufsize optional argument specifies the size of chunks by
which data is read. Its default value is target-specific.
readLine ():String
Available on  Neko, Android, iOS, macOS, Linux, Windows
Read a line of text separated by CR and/or LF bytes.
The CR/LF characters are not included in the resulting string.