public void testCollisionsDueToIncorrectSignExtension() {
    byte[] col1 = new byte[] {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, (byte) 0x80};
    byte[] col2 = new byte[] {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, (byte) 0x81};
    byte[] col3 = new byte[] {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, (byte) 0xff};

    ImmutableSet<HashCode> hashCodes =
        ImmutableSet.of(

	}
	// write "LastUpdate"
	err = en.Append(0xaa, 0x4c, 0x61, 0x73, 0x74, 0x55, 0x70, 0x64, 0x61, 0x74, 0x65)
	if err != nil {
		return
	}
	err = en.WriteTime(z.LastUpdate)
	if err != nil {
		err = msgp.WrapError(err, "LastUpdate")
		return
	}
	// write "SkipHealing"
	err = en.Append(0xab, 0x53, 0x6b, 0x69, 0x70, 0x48, 0x65, 0x61, 0x6c, 0x69, 0x6e, 0x67)
	if err != nil {
		return
	}

	o = append(o, 0xa3, 0x62, 0x6b, 0x74)
	o = msgp.AppendString(o, z.Bucket)
	// string "pfx"
	o = append(o, 0xa3, 0x70, 0x66, 0x78)
	o = msgp.AppendString(o, z.Prefix)
	// string "obj"
	o = append(o, 0xa3, 0x6f, 0x62, 0x6a)
	o = msgp.AppendString(o, z.Object)
	// string "id"
	o = append(o, 0xa2, 0x69, 0x64)
	o = msgp.AppendInt64(o, z.ItemsDecommissioned)
	// string "idf"
	o = append(o, 0xa3, 0x69, 0x64, 0x66)

      0x64,
      0x65,
      0x66,
      0x67,
      0x68,
      0x69,
      0x6a,
      0x6b,
      0x6c,
      0x6d,
      0x6e,
      0x6f,
      0x70,
      0x71,
      0x72,
      0xfc,
      0x73,
      0xfd,
      0x1ffb,
      0x7fff0,
      0x1ffc,
      0x3ffc,
      0x22,
      0x7ffd,
      0x3,
      0x23,
      0x4,
      0x24,

	// write "LocksAbandoned"
	err = en.Append(0xae, 0x4c, 0x6f, 0x63, 0x6b, 0x73, 0x41, 0x62, 0x61, 0x6e, 0x64, 0x6f, 0x6e, 0x65, 0x64)
	if err != nil {
		return
	}
	err = en.WriteInt(z.LocksAbandoned)
	if err != nil {
		err = msgp.WrapError(err, "LocksAbandoned")
		return
	}
	// write "LastCleanup"
	err = en.Append(0xab, 0x4c, 0x61, 0x73, 0x74, 0x43, 0x6c, 0x65, 0x61, 0x6e, 0x75, 0x70)
	if err != nil {
		return
	}

	o = msgp.AppendInt64(o, z.BandWidthLimitInBytesPerSecond)
	// string "CurrentBandwidthInBytesPerSecond"
	o = append(o, 0xd9, 0x20, 0x43, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x74, 0x42, 0x61, 0x6e, 0x64, 0x77, 0x69, 0x64, 0x74, 0x68, 0x49, 0x6e, 0x42, 0x79, 0x74, 0x65, 0x73, 0x50, 0x65, 0x72, 0x53, 0x65, 0x63, 0x6f, 0x6e, 0x64)

		o = append(o, 0x82, 0xa6, 0x54, 0x6f, 0x74, 0x61, 0x6c, 0x73)
		o = msgp.AppendArrayHeader(o, uint32(60))
		for za0002 := range z[za0001].Totals {
			// map header, size 3
			// string "Total"
			o = append(o, 0x83, 0xa5, 0x54, 0x6f, 0x74, 0x61, 0x6c)
			o = msgp.AppendInt64(o, z[za0001].Totals[za0002].Total)
			// string "Size"
			o = append(o, 0xa4, 0x53, 0x69, 0x7a, 0x65)

	// write "OlderThan"
	err = en.Append(0x88, 0xa9, 0x4f, 0x6c, 0x64, 0x65, 0x72, 0x54, 0x68, 0x61, 0x6e)
	if err != nil {
		return
	}
	err = z.OlderThan.EncodeMsg(en)
	if err != nil {
		err = msgp.WrapError(err, "OlderThan")
		return
	}
	// write "CreatedBefore"
	err = en.Append(0xad, 0x43, 0x72, 0x65, 0x61, 0x74, 0x65, 0x64, 0x42, 0x65, 0x66, 0x6f, 0x72, 0x65)
	if err != nil {
		return
	}

	o = append(o, 0xae, 0x52, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x65, 0x64, 0x53, 0x69, 0x7a, 0x65)
	o = msgp.AppendInt64(o, z.ReplicatedSize)
	// string "ReplicatedCount"
	o = append(o, 0xaf, 0x52, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x65, 0x64, 0x43, 0x6f, 0x75, 0x6e, 0x74)
	o = msgp.AppendInt64(o, z.ReplicatedCount)
	// string "Failed"
	o = append(o, 0xa6, 0x46, 0x61, 0x69, 0x6c, 0x65, 0x64)
	o, err = z.Failed.MarshalMsg(o)

	// string "SecretKey"
	o = append(o, 0xa9, 0x53, 0x65, 0x63, 0x72, 0x65, 0x74, 0x4b, 0x65, 0x79)
	o = msgp.AppendString(o, z.Creds.SecretKey)
	// string "SessionToken"
	o = append(o, 0xac, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x54, 0x6f, 0x6b, 0x65, 0x6e)
	o = msgp.AppendString(o, z.Creds.SessionToken)
	// string "Snowball"
	o = append(o, 0xa8, 0x53, 0x6e, 0x6f, 0x77, 0x62, 0x61, 0x6c, 0x6c)
	o, err = z.Snowball.MarshalMsg(o)