more work

node_modules/lodash/internal/baseMerge.js

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+var arrayEach = require('./arrayEach'),
+    baseMergeDeep = require('./baseMergeDeep'),
+    getSymbols = require('./getSymbols'),
+    isArray = require('../lang/isArray'),
+    isLength = require('./isLength'),
+    isObject = require('../lang/isObject'),
+    isObjectLike = require('./isObjectLike'),
+    isTypedArray = require('../lang/isTypedArray'),
+    keys = require('../object/keys');
+
+/** Used for native method references. */
+var arrayProto = Array.prototype;
+
+/** Native method references. */
+var push = arrayProto.push;
+
+/**
+ * The base implementation of `_.merge` without support for argument juggling,
+ * multiple sources, and `this` binding `customizer` functions.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @param {Function} [customizer] The function to customize merging properties.
+ * @param {Array} [stackA=[]] Tracks traversed source objects.
+ * @param {Array} [stackB=[]] Associates values with source counterparts.
+ * @returns {Object} Returns `object`.
+ */
+function baseMerge(object, source, customizer, stackA, stackB) {
+  if (!isObject(object)) {
+    return object;
+  }
+  var isSrcArr = isLength(source.length) && (isArray(source) || isTypedArray(source));
+  if (!isSrcArr) {
+    var props = keys(source);
+    push.apply(props, getSymbols(source));
+  }
+  arrayEach(props || source, function(srcValue, key) {
+    if (props) {
+      key = srcValue;
+      srcValue = source[key];
+    }
+    if (isObjectLike(srcValue)) {
+      stackA || (stackA = []);
+      stackB || (stackB = []);
+      baseMergeDeep(object, source, key, baseMerge, customizer, stackA, stackB);
+    }
+    else {
+      var value = object[key],
+          result = customizer ? customizer(value, srcValue, key, object, source) : undefined,
+          isCommon = result === undefined;
+
+      if (isCommon) {
+        result = srcValue;
+      }
+      if ((isSrcArr || result !== undefined) &&
+          (isCommon || (result === result ? (result !== value) : (value === value)))) {
+        object[key] = result;
+      }
+    }
+  });
+  return object;
+}
+
+module.exports = baseMerge;