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Const everything by default
If you need to mutate it, you don’t, you need to refactor.
Dogmatic statements like this lead to bad, messy code. I’m a firm believer that you should use whatever style fits the problem most.
Although I agree most code would be better if people followed this dogma, sometimes mutability is just more clean/idiomatic/efficient/…
Define your terms before relying on platitudes. Mutability isn’t cleaner if we want composition, particularly in the face of concurrency. Being idiomatic isn’t good or bad, but patterned; not all patterns are universally desirable. The only one which stands up to scrutiny is efficiency, which leads to the cult of performance-at-all-costs if one is not thoughtful.