( a : 2 )

[tavmem]

This is a minor difference between k2.8 and kona, but it's probably best to document it.
I do not consider it a bug ... but kona alignment with k is an enhancement to kona.

In k2.8

$ rlwrap -n ./k
K 2.8 2000-10-10 Copyright (C) 1993-2000 Kx Systems
Evaluation. Not for commercial use. 
\ for help. \\ to exit.

  (a:2)

In kona

$ rlwrap -n ./k
kona      \ for help. \\ to exit.

  (a:2)
2