I don't think naming convention is the kind of stuff that helps save tokens, specially considering how text is tokenized.

On the other hand, being able to write 'list.filter(v => v.selected)' (or something similar) instead of:

  listFiltered := []Item{}
  for _, item := range list {
    if item.selected {
      listFiltered = append(listFiltered, item)
    }
  }

You can have that with generic functions, although Go's lambda syntax is too verbose. The slices package has DeleteFunc, which is kind of the opposite. I don't know why they have Filter.

https://pkg.go.dev/slices#DeleteFunc