This code doesn't do what you think it does:

func f(x, y reflect.Value) bool {
    return reflect.DeepEqual(x, y)
}

It compares the internal details of the two reflect.Value structs, not their contents. The correct code would be reflect.DeepEqual(x.Interface(), y.Interface()).

I don't see any reason why you'd ever want to use DeepEqual on a reflect.Value. Hence no false positives.

If you really wanted to compare two reflect.Values (but you shouldn't), == is equivalent to DeepEqual.

Seems like an easy mistake to make (see #43986 ). Not sure how common it might be, but I suspect it might be common enough to warrant a check.