akka/akka — pull request #402 by oschulz (2012-04-20 12:33:38+00:00)
Title: Added CompactByteString

* CompactByteString provides an instance of ByteString that is
guaranteed to be compact and has performance-optimized element
acces (since no range-checking is necessary)

* sealed abstract class ByteString, since the implementations of
ByteString1 and ByteStings assume a fixed set of ByteString
classes (in pattern matching).