But the compiler isn’t “not allowed to re-order fields”. The spec allows it to do that. This fix works for the current compiler, but may not do so for next week

But the compiler isn’t “not allowed to re-order fields”. The spec allows it to do that. This fix works for the current compiler, but may not do so for next week’s. Technically you could say it wouldn’t even be a breaking change if a compiler update changed that (practically people would have reason to be angry if they slipped something like that in without creating a major version and adding warning flags to the release notes)