dataframe and ismatrix

[CdeMills]

Hello,
actually, a few functions from statistics/base choke on dataframe arguments
because they use 'ismatrix' to detect whether or not the argument is a
matrix. I can overload 'ismatrix' to return "true" if the dataframe can be
converted to a matrix, but I would like to know a bit more about its
working. As
ismatrix(3)
isvector(3)
isnumeric(3)
all returns "true", what is the exact test criterion behind those functions
?

Regards

Pascal
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