mikera/matrix-api — pull request #26 by siscia (2013-02-25 20:43:19+00:00)
Title: Add is-matrix?

I am not sure if it is a good design choice, however I think it may be very handy to have a function that return if the object is something we are suppose to handle in some way or if it is nothing...

I found it helpful with assign! for instance...