RFE: taskopen -0 (-1, -3 etc)
Using a numeric option-flag limits the number of matching annotations that will be listed, similar to the taskwarrior limit:<number-of-rows> option. This can be used to show only -# of annotations, to narrow the scope to the top # of any given query/ sort.
-1 is kind of special, directly opening the top-most annot (this is totally sort-dependent) no matter how many matches are found (as long as there exists at least 1).
-2, -5, -10 can be used for generating manageable batches of the oldest, newest, biggest, most urgent, most neglected.. you name it. 
-0 could be used as well, listing and opening zero annotations, but instead displaying the count of annotations that match the query. 
