this goes to the bone of kixtart.
the freenes is to do:

if instr("acb","b")

it's instr and as such true, but kixtart also returns a value for that.
so, it actually checks for true/false and location.
this also raises the issue how well kix can have a hn specification as also:
if "a"

results in true.
but, this is one of the strengths of kixtart and I would not go disturb this with standardation.
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