Changes

node_modules/mongoose/lib/schema/boolean.js

@@ -224,6 +224,30 @@ SchemaBoolean.prototype.castForQuery = function($conditional, val) {
   return this._castForQuery($conditional);
 };
 
+/**
+ *
+ * @api private
+ */
+
+SchemaBoolean.prototype._castNullish = function _castNullish(v) {
+  if (typeof v === 'undefined' && this.$$context != null && this.$$context._mongooseOptions.omitUndefined) {
+    return v;
+  }
+  const castBoolean = typeof this.constructor.cast === 'function' ?
+    this.constructor.cast() :
+    SchemaBoolean.cast();
+  if (castBoolean == null) {
+    return v;
+  }
+  if (castBoolean.convertToFalse instanceof Set && castBoolean.convertToFalse.has(v)) {
+    return false;
+  }
+  if (castBoolean.convertToTrue instanceof Set && castBoolean.convertToTrue.has(v)) {
+    return true;
+  }
+  return v;
+};
+
 /*!
  * Module exports.
  */