Filtering arp records by the "who-has" and "tell" IPs

[The Branches]

Could someone please remind me how to filter based on the IPs in arp 
requests?  I know arp packets don't technically have a source and 
destination IP but I thought for sure that argus interpreted the "tell" 
field as source IP and the "who-has" field as the destination IP.

I though the syntax to filter for all the arp requests generated by host 
1.2.3.4 was like this
     ra -r flowfile - "arp src host 1.2.3.4"
But this seems to only pick up non-arp traffic for that host.

I know I can do an "arp and ether src host xx:xx:xx:xx:xx:xx" to get the 
above to work, but that method won't work when wanting to filter on who 
is being arped for.

I know racluster understands the IPs in arp requests as the src/dst IP 
of the flow  because this works nicely
     racluster -r flowfile - "arp" -m saddr daddr

Anyway, thanks in advance for some pointers on this.
Kevin