Log Message:
(math/R-classInt) Update 0.4.8 to 0.4.9, make test passed

## Version 0.4-9

- #41 issues. The maximum and minimum breaks are set to \code{+Inf}
   and \code{-Inf} to avoid errors induced in the earlier version
   where breaks could cease to be strictly ascending. The
   \code{legacy=} argument with value \code{TRUE} may be used to
   revert to the previous behaviour.