Filter type 'appbytes' behavior unexpected

[Jesse Bowling]

Hello,

I noticed while looking at some data that using the filter type
'appbytes' appears to filter on either sappbytes or dappbytes, but not
on appbytes, which is unexpected to me. From the man page:

       [src | dst] appbytes [gt | gte | lt | lte | eq] number
              True if the application byte count in the Argus record
(default) equals number.

For instance, I would expect this invocation:

ra -r test.argus -s sappbytes dappbytes appbytes - appbytes eq 2760

To display output for only flows whose total application bytes
(appbytes) equals 2760. Instead the behavior I see is that I get flows
which have 2760 bytes in either sappbytes or dappbytes.

   SAppBytes    DAppBytes TotAppByte
         151         2760       2911
         169         2760       2929
        2760          151       2911
         151         2760       2911

I can see the utility of this behavior, but based on the documentation I
would not expect this result. I'm seeing the same results from 3.0.7.9
-> 3.0.7.15.

Is the current behavior the 'correct' behavior or a bug?

Thanks,

Jesse