I decided to dig further. Maxima's documentation 
<http://maxima.sourceforge.net/docs/manual/maxima_singlepage.html#SEC93> 
contains information that Sage's docs lack:

infinity (complex infinity) is returned when the limit of the absolute 
> value of the expression is positive infinity, but the limit of the 
> expression itself is not positive infinity or negative infinity.
>

That explains it. I guess that if a Maxima user sees infinity, then s/he 
knows to do something more to resolve whether it's inf or minf. But:

   1. Should Sage's documentation include this, as well?
   2. Is there some way in Sage to distinguish Maxima's complex infinity 
   from Sage's +infinity, the way Maxima itself does?
   

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