"array_or_vector" is the class union of
c("array", "matrix", "vector") and exists for its use in
signatures of method definitions.
"array_or_vector" instead of just
"vector" in a
signature makes an important difference: E.g., if we had
setMethod(crossprod, c(x="mpfr", y="vector"), function(x,y) CPR(x,y)),
crossprod(x, matrix(1:6, 2,3)) would extend into a call
CPR(x, as(y, "vector")) such that
argument would simply be a vector instead of the desired
2 x 3 matrix.
A virtual Class: No objects may be created from it.
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