ch.tutteli.kbox.kotlin.collections.List

appendToStringBuilder	`fun <T> List<T>.appendToStringBuilder(sb: StringBuilder, separator: String, append: (it: T, StringBuilder) -> Unit): Unit`
flatten	`fun <T, T2> List<T>.flatten(getter: (it: T) -> List<T2>): List<T2>`
joinToString	`fun <T> List<T>.joinToString(separator: String, append: (it: T, StringBuilder) -> Unit): String`