在iOS中，以“new”前缀开头的属性名会导致BAD_ACCESS错误

My property was declared in my NSManagedObject class with name "newPrice", which leads to "zombie object". After some hours of debugging I figured out that there is problem with method which is releasing this object but not retaining it. After renaming this property to "priceNew" everything goes well. I don't understand why this is causing problem.My property was declared in my NSManagedObject