Or you could look at it as "relaxed ordering is a performance optimization" and shouldn't be taken prematurely. In Java, there is no default; you ask for a Has

Or you could look at it as "relaxed ordering is a performance optimization" and shouldn't be taken prematurely. In Java, there is no default; you ask for a HashMap or a LinkedHashMap explicitly. In dynamic languages like Python or JS I prefer default insertion ordered maps because if I wanted tightly optimized code, I wouldn't use those languages in the first place.