When you think `class(.) == *`, think again!

short lines !! – Historical relict: R matrix is not an array In a recent discussion on the R-devel mailing list, in a thread started on July 8, head.matrix can return 1000s of columns – limit to n or add new argument? Michael Chirico and then Gabe Becker where proposing to generalize the head() and tail() utility functions, and Gabe noted that current (pre R-4.x.y) head() would not treat array specially.