private Boolean decodeBoolean(byte[] in) {
    assert in.length == 2 : "Wrong length for a boolean";
    return Boolean.valueOf(in[1] == 1);
  }
Handles old whalin (tested with v1.6) encoding: data type is in the first
byte of the value.

@author bpartensky
@since Oct 16, 2008
src/main/java/net/spy/memcached/transcoders/WhalinV1Transcoder.java