fails:Kernel.rand returns a float for an range argument where max is < 1
fails:Kernel.rand given an exclusive range returns a Float between the given Integer and Float
fails:Kernel.rand given an exclusive range returns a Float between the given Float and Integer
fails:Kernel.rand given an exclusive range returns a Float between the two given Floats
fails:Kernel.rand returns nil when range is backwards
fails:Kernel.rand returns the range start/end when Float range is 0
