In many cases, relative tolerances for approximate comparisons are more useful than absolute ones.
If e.g. my DataFrame contains some numbers in the range of 1.0E10 and some in 1.0E-10 I would have to set a high absolute tolerance which would miss differences in the small numbers.

If that is OK, I would create a PR that either adds a second relativeTol parameter with default value, which gets only used if tol == 0.0 or create a different set of methods altogether.