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diff --git a/node_modules/mongoose/lib/schema/mixed.js b/node_modules/mongoose/lib/schema/mixed.js
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+++ b/node_modules/mongoose/lib/schema/mixed.js
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+/*!
+ * Module dependencies.
+ */
+
+'use strict';
+
+const SchemaType = require('../schematype');
+const symbols = require('./symbols');
+const isObject = require('../helpers/isObject');
+
+/**
+ * Mixed SchemaType constructor.
+ *
+ * @param {String} path
+ * @param {Object} options
+ * @inherits SchemaType
+ * @api public
+ */
+
+function Mixed(path, options) {
+  if (options && options.default) {
+    const def = options.default;
+    if (Array.isArray(def) && def.length === 0) {
+      // make sure empty array defaults are handled
+      options.default = Array;
+    } else if (!options.shared && isObject(def) && Object.keys(def).length === 0) {
+      // prevent odd "shared" objects between documents
+      options.default = function() {
+        return {};
+      };
+    }
+  }
+
+  SchemaType.call(this, path, options, 'Mixed');
+
+  this[symbols.schemaMixedSymbol] = true;
+}
+
+/**
+ * This schema type's name, to defend against minifiers that mangle
+ * function names.
+ *
+ * @api public
+ */
+Mixed.schemaName = 'Mixed';
+
+Mixed.defaultOptions = {};
+
+/*!
+ * Inherits from SchemaType.
+ */
+Mixed.prototype = Object.create(SchemaType.prototype);
+Mixed.prototype.constructor = Mixed;
+
+/**
+ * Attaches a getter for all Mixed paths.
+ *
+ * ####Example:
+ *
+ *     // Hide the 'hidden' path
+ *     mongoose.Schema.Mixed.get(v => Object.assign({}, v, { hidden: null }));
+ *
+ *     const Model = mongoose.model('Test', new Schema({ test: {} }));
+ *     new Model({ test: { hidden: 'Secret!' } }).test.hidden; // null
+ *
+ * @param {Function} getter
+ * @return {this}
+ * @function get
+ * @static
+ * @api public
+ */
+
+Mixed.get = SchemaType.get;
+
+/**
+ * Sets a default option for all Mixed instances.
+ *
+ * ####Example:
+ *
+ *     // Make all mixed instances have `required` of true by default.
+ *     mongoose.Schema.Mixed.set('required', true);
+ *
+ *     const User = mongoose.model('User', new Schema({ test: mongoose.Mixed }));
+ *     new User({ }).validateSync().errors.test.message; // Path `test` is required.
+ *
+ * @param {String} option - The option you'd like to set the value for
+ * @param {*} value - value for option
+ * @return {undefined}
+ * @function set
+ * @static
+ * @api public
+ */
+
+Mixed.set = SchemaType.set;
+
+/**
+ * Casts `val` for Mixed.
+ *
+ * _this is a no-op_
+ *
+ * @param {Object} value to cast
+ * @api private
+ */
+
+Mixed.prototype.cast = function(val) {
+  return val;
+};
+
+/**
+ * Casts contents for queries.
+ *
+ * @param {String} $cond
+ * @param {any} [val]
+ * @api private
+ */
+
+Mixed.prototype.castForQuery = function($cond, val) {
+  if (arguments.length === 2) {
+    return val;
+  }
+  return $cond;
+};
+
+/*!
+ * Module exports.
+ */
+
+module.exports = Mixed;