fix: assign notation

source/assign.js

@@ -2,6 +2,7 @@ var isFn = require('./is/function');
 var isObject = require('./is/object');
 
 module.exports = function (strategy) {
+	var notation = '';
 	return function assign(target) {
 		var args = Array.prototype.slice.call(arguments);
 		var output = Object(target || {});
@@ -12,17 +13,19 @@ module.exports = function (strategy) {
 				var key = keys[iy];
 				var outputValue = output[key];
 				var sourceValue = from[key];
-				var notation = key;
 				if (Array.isArray(outputValue) || Array.isArray(sourceValue)) {
 					var f = Array.isArray(sourceValue) ? sourceValue.slice() : [];
 					var o = Array.isArray(outputValue) ? outputValue.slice() : [];
-					output[key] = strategy(f, o, notation, keys);
+					output[key] = strategy(f, o, notation + '.' + key, keys);
 				} else if (isFn(outputValue) || isFn(sourceValue)) {
-					output[key] = strategy(sourceValue, outputValue, notation, keys);
+					output[key] = strategy(sourceValue, outputValue, notation + '.' + key, keys);
 				} else if (isObject(outputValue) || isObject(sourceValue)) {
+					var cn = notation;
+					notation = `${cn ? cn + '.' : ''}${key}`;
 					output[key] = assign(outputValue, sourceValue);
+					notation = cn;
 				} else {
-					output[key] = strategy(sourceValue, outputValue, notation, keys);
+					output[key] = strategy(sourceValue, outputValue, notation + '.' + key, keys);
 				}
 			}
 		}