question on collecting t_MAT

Doc says that "Matrices are internally represented as a vector of 
columns".
But shouldn't below return a 2-element vector of "t_MAT" entries?

? [type(A)|e<-[1,2];A<-matrix(2,2,x,y,e)]
["t_COL", "t_COL", "t_COL", "t_COL"]
?

If not, how to modify to result in ["t_MAT", "t_MAT"] ?

Regards,

Hermann.