Triggering such a "method" would lead to a segfault due to a stack overflow.

Of course one can still trigger this by e.g. having two operations `foo` and
`bar, and installing `foo` as method for `bar` and vice-versa. But that is far
less likely to happen by accident. Also, it seems better to fix at least some
instances of this issue than to give up because we can't fix it completely.