fails:Kernel.rand returns an integer for an integer argument
fails:Kernel.rand returns an integer for a float argument greater than 1
fails:Kernel.rand returns a float for an argument between -1 and 1
fails:Kernel.rand ignores the sign of the argument
fails:Kernel.rand never returns a value greater or equal to 1.0 with no arguments
fails:Kernel.rand never returns a value greater or equal to any passed in max argument
fails:Kernel.rand calls to_int on its argument
fails:Kernel.rand returns a float for an range argument where max is < 1
fails:Kernel#rand needs to be reviewed for spec completeness
