v0.3.1
* Fix IsZero to properly report false for IsZero(-0.0) since we define IsZero as whether it is equal to the zero memory value. * Add note to isLess that we don't need to handle -0.0 since we can't possibly have both keys present in the same map. * Use sort.SliceStable in SortedKeys for deterministic output since it is possible to have both -0.0 and +0.0 from two different maps. The zero key from the left left map will be taken over the right map.