This thread prompted me to try the following:
  4$!.999[''
999 999 999 999
   4$''
|length error
|   4    $''

I was expecting 'length error' in both cases.
I'm not complaining - but was I wrong to do so?

Regards
David
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Henry Rich wrote: Wed Nov 28 02:53:23 HKT 2007
>The support is in two places (I'm guessing).  !. looks at its
>u and v and sees if they match one of the supported forms; if so,
>it makes a mark to tell the u verb what the fill was.  The support
>is in both places, I would guess.
>
>You are right in general that (u conj v) might just vector off
>to special code, but I'd be surprised if ;!.f did that.
>
>Henry Rich
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