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I think the slice append semantics are very error-prone, and it would have been better if a slice was a shareable reference to a single mutable thing, like a map (or a list from Python or Java or …)

>If you had a reference into a map

Maps in golang are of reference type, just to be clear.

https://go.dev/blog/maps

implementation: https://go.dev/src/runtime/map.go

Indeed, removing values from a map while iterating over it in Go is safe and guaranteed to have the expected behavior.