[Rd] order function called on a data.frame?

[Jan Gorecki]

Hi,
base::order main input arguments are defined as:

a sequence of numeric, complex, character or logical vectors, all of
the same length, or a classed R object

When passing a list or a data.frame, the resuts seems to be a bit
useless. Shouldn't that raise an error, or at least warning?

Best Regards,
Jan Gorecki