Refactoring day1

node_modules/mongoose/lib/schema/boolean.js

@@ -224,30 +224,6 @@ 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.
  */