Not everything can be handled by a minifier. Consider multiple accesses of `item.prop` where `prop` is optional. You can cache `item.prop` in a variable to avoi

Not everything can be handled by a minifier. Consider multiple accesses of `item.prop` where `prop` is optional. You can cache `item.prop` in a variable to avoid multiple checks but the minifier usually cannot revert it back to the previous form as it has to take into account the possibility that `item.prop` is a getter in which case such a replacement would potentially change semantics.