message: java core: Remove FIXME: We encode \0 properly.
diff: @@ -81,7 +81,6 @@ class BinaryStreamWriter<out T : OutputStream>(private val stream: T) {
  }
  fun writeString(value: String) {
  - // FIXME: Make sure this generates null bytes and not \u0000.
  val encoded = value.toByteArray(UTF8)
  writeBytes(encoded)
  }
  