Add more arity hints.

lodash.js

@@ -4494,7 +4494,7 @@
         var func = isArray(collection) ? arrayAggregator : baseAggregator,
             accumulator = initializer ? initializer() : {};
 
-        return func(collection, setter, getIteratee(iteratee), accumulator);
+        return func(collection, setter, getIteratee(iteratee, 2), accumulator);
       };
     }
 
@@ -6463,7 +6463,7 @@
         iteratee = undefined;
       }
       return isArrayLikeObject(array)
-        ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee))
+        ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
         : [];
     });
 
@@ -7017,7 +7017,7 @@
         mapped.pop();
       }
       return (mapped.length && mapped[0] === arrays[0])
-        ? baseIntersection(mapped, getIteratee(iteratee))
+        ? baseIntersection(mapped, getIteratee(iteratee, 2))
         : [];
     });
 
@@ -7242,7 +7242,7 @@
      */
     function pullAllBy(array, values, iteratee) {
       return (array && array.length && values && values.length)
-        ? basePullAll(array, values, getIteratee(iteratee))
+        ? basePullAll(array, values, getIteratee(iteratee, 2))
         : array;
     }
 
@@ -7469,7 +7469,7 @@
      * // => 0
      */
     function sortedIndexBy(array, value, iteratee) {
-      return baseSortedIndexBy(array, value, getIteratee(iteratee));
+      return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
     }
 
     /**
@@ -7548,7 +7548,7 @@
      * // => 1
      */
     function sortedLastIndexBy(array, value, iteratee) {
-      return baseSortedIndexBy(array, value, getIteratee(iteratee), true);
+      return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
     }
 
     /**
@@ -7617,7 +7617,7 @@
      */
     function sortedUniqBy(array, iteratee) {
       return (array && array.length)
-        ? baseSortedUniq(array, getIteratee(iteratee))
+        ? baseSortedUniq(array, getIteratee(iteratee, 2))
         : [];
     }
 
@@ -7840,7 +7840,7 @@
       if (isArrayLikeObject(iteratee)) {
         iteratee = undefined;
       }
-      return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee));
+      return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
     });
 
     /**
@@ -7919,7 +7919,7 @@
      */
     function uniqBy(array, iteratee) {
       return (array && array.length)
-        ? baseUniq(array, getIteratee(iteratee))
+        ? baseUniq(array, getIteratee(iteratee, 2))
         : [];
     }
 
@@ -8093,7 +8093,7 @@
       if (isArrayLikeObject(iteratee)) {
         iteratee = undefined;
       }
-      return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee));
+      return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
     });
 
     /**
@@ -15787,7 +15787,7 @@
      */
     function maxBy(array, iteratee) {
       return (array && array.length)
-        ? baseExtremum(array, getIteratee(iteratee), baseGt)
+        ? baseExtremum(array, getIteratee(iteratee, 2), baseGt)
         : undefined;
     }
 
@@ -15833,7 +15833,7 @@
      * // => 5
      */
     function meanBy(array, iteratee) {
-      return baseMean(array, getIteratee(iteratee));
+      return baseMean(array, getIteratee(iteratee, 2));
     }
 
     /**
@@ -15885,7 +15885,7 @@
      */
     function minBy(array, iteratee) {
       return (array && array.length)
-        ? baseExtremum(array, getIteratee(iteratee), baseLt)
+        ? baseExtremum(array, getIteratee(iteratee, 2), baseLt)
         : undefined;
     }
 
@@ -15995,7 +15995,7 @@
      */
     function sumBy(array, iteratee) {
       return (array && array.length)
-        ? baseSum(array, getIteratee(iteratee))
+        ? baseSum(array, getIteratee(iteratee, 2))
         : 0;
     }