refactor(document): remove "clone" where previously necessary because of "utils.options"

Author: hasezoey

lib/document.js

@@ -3690,8 +3690,8 @@ Document.prototype.$toObject = function(options, json) {
   const schemaOptions = this.$__schema && this.$__schema.options || {};
   // merge base default options with Schema's set default options if available.
   // `clone` is necessary here because `utils.options` directly modifies the second input.
-  defaultOptions = { ...defaultOptions, ...clone(baseOptions) };
-  defaultOptions = { ...defaultOptions, ...clone(schemaOptions[path] || {}) };
+  defaultOptions = { ...defaultOptions, ...baseOptions };
+  defaultOptions = { ...defaultOptions, ...schemaOptions[path] };
 
   // If options do not exist or is not an object, set it to empty object
   options = utils.isPOJO(options) ? { ...options } : {};

lib/schema.js

@@ -578,7 +578,7 @@ Schema.prototype.defaultOptions = function(options) {
     _id: true,
     id: id,
     typeKey: 'type',
-    ...clone(options)
+    ...options
   };
 
   if (options.versionKey && typeof options.versionKey !== 'string') {