As I hit send I realized I did know of one, which is table objects. So
while we're discussing it we can talk about both generally and specifically
what head.table and tail.table should do. Looks like tail.table is already
special -cased to hit the matrix method if it is 2d, so the natural
extension
Thanks Martin and Peter,
I agree that we can be careful and narrow and still see a nice improvement
in behavior. While Herve's point is valid and I understand his frustration,
I think staying within the matrix vs c(matrix, array) space is the right
scope for this work in terms of fiddling with in
