>>> i've been trying to figure out exactly when one would lose with
>>> [autodep] and i've not come up with anything yet..
>> [...example...]
> That would be a bug.  If a .OPTIONAL file is missing, the thing that
> depended on it should be considered out of date.

Ah.  Yes, if you do that, I think you are safe.  But that's not what
"optional" says to (at least) me; some other name might reduce human
confusion.

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