Bump to v4.6.0.

_baseSortedUniqBy.js

@@ -15,7 +15,7 @@ define(['./eq'], function(eq) {
         value = array[0],
         computed = iteratee ? iteratee(value) : value,
         seen = computed,
-        resIndex = 0,
+        resIndex = 1,
         result = [value];
 
     while (++index < length) {
@@ -24,7 +24,7 @@ define(['./eq'], function(eq) {
 
       if (!eq(computed, seen)) {
         seen = computed;
-        result[++resIndex] = value;
+        result[resIndex++] = value;
       }
     }
     return result;