private Integer decodeInteger(byte[] in) {
    assert in.length == 5 : "Wrong length for an int";
    return Integer.valueOf((int) decodeLong(in).longValue());

  }
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