When they changed the iteration order of HashMap keys (1.7 I think?), tons of code broke, although fortunately mostly tests. It was easy to depend on it by doin

When they changed the iteration order of HashMap keys (1.7 I think?), tons of code broke, although fortunately mostly tests. It was easy to depend on it by doing something like creating a gold file test with expected results. They don't want code to break like that, which means they need to preserve this sort of thing.