Surface area measurement or counted object?

[MrLogarithm]

Usually sar is a unit of area, as in 3(u) sar szum2 sikil "30 sar (1080 m^2) of garlic". What does it refer to in:

2(asz) szum2 sikil 2(asz) sar 2(asz) ku6 dar-ra

It is apparently not measuring an area of land as in the first example, since the following entry counts filleted fish rather than anything that could be planted. But ePSD has no definitions of sar that make sense as a counted object.

Should the conversion module handle this as a cardinal number or an area measurement?