Naming.

lib/cow-value-model.js

@@ -68,9 +68,9 @@ var cowWorkshop = exports.cowWorkshop = function cowWorkshop(keys) {
         keys.forEach(function (key, index) {
             var value = fn(cowValueModel(key)(obj));
             var modifier = cowValueModel(resultKeys[index]);
-            var oldDst = result;
-            result = modifier(oldDst, value);
-            if (result !== oldDst) {
+            var oldResult = result;
+            result = modifier(oldResult, value);
+            if (result !== oldResult) {
                 diff = modifier(diff, value);
             }
         });

src/cow-value-model.js

@@ -37,9 +37,9 @@ export const cowWorkshop = (keys, fn = x => x) => (obj, {result = obj, resultKey
     keys.forEach((key, index) => {
         const value = fn(cowValueModel(key)(obj));
         const modifier = cowValueModel(resultKeys[index]);
-        const oldDst = result;
-        result = modifier(oldDst, value);
-        if (result !== oldDst) {
+        const oldResult = result;
+        result = modifier(oldResult, value);
+        if (result !== oldResult) {
             diff = modifier(diff, value);
         }
     });