append

fun Output.append(csq: CharSequence, start: Int = 0, end: Int = csq.length): Appendable
fun Output.append(csq: CharArray, start: Int = 0, end: Int = csq.size): Appendable


fun Buffer.append(csq: CharSequence?, start: Int, end: Int): Buffer
fun Buffer.append(csq: CharArray, start: Int, end: Int): Buffer

Deprecated (with error)

This is no longer supported. Use a packet builder to append characters instead.