ahh now I understand my underlying misconception! shifting
@$_ i, wrongly, supposed the array to disappear from
@_ when empty! while in reality it just trun to be
[] an empty one, so i get an infinite call to
&inter([],[],[])
L*
There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.