Update document.js

Author: vkarpov15

lib/document.js

@@ -1020,9 +1020,6 @@ Document.prototype.overwrite = function overwrite(obj) {
  */
 
 Document.prototype.$set = function $set(path, val, type, options) {
-  if (path._id && path.id) {
-    delete path.id;
-  }
   if (utils.isPOJO(type)) {
     options = type;
     type = undefined;
@@ -1063,6 +1060,10 @@ Document.prototype.$set = function $set(path, val, type, options) {
       [path, val] = [val, path];
     }
 
+    if ('_id' in path && 'id' in path) {
+      delete path.id;
+    }
+
     prefix = val ? val + '.' : '';
     keys = getKeysInSchemaOrder(this.$__schema, path);