Extensions for java.io.OutputStream
Platform and version requirements: JVM (1.0)  
 
 buffered
Creates a buffered output stream wrapping this stream.
fun OutputStream.buffered( bufferSize: Int = DEFAULT_BUFFER_SIZE ): BufferedOutputStream
Platform and version requirements: JVM (1.0)  
 
  bufferedWriter
Creates a buffered writer on this output stream using UTF-8 or the specified charset.
fun OutputStream.bufferedWriter( charset: Charset = Charsets.UTF_8 ): BufferedWriter
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    https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io/java.io.-output-stream/index.html