Isn't this supposed to be safe to do in Go?

https://go.dev/ref/spec#For_range

If a map entry that has not yet been reached is removed during iteration, the corresponding iteration value will not be produced

The relevant section @QuentinI is referencing:

3. The iteration order over maps is not specified and is not guaranteed to be the same from one iteration to the next. If a map entry that has not yet been reached is removed during iteration, the corresponding iteration value will not be produced. If a map entry is created during iteration, that entry may be produced during the iteration or may be skipped. The choice may vary for each entry created and from one iteration to the next. If the map is nil, the number of iterations is 0.

It is safe to remove entries that have not yet been encountered. That being said, I would likely still prefer to not take advantage of such a feature, and be consistent with other languages in this case.