Yeah, it is a rare problem, but it's not that rare when writing anything generic. For example, look at all the special-casing of null (ctrl-f "null") in the Jav

Yeah, it is a rare problem, but it's not that rare when writing anything generic. For example, look at all the special-casing of null (ctrl-f "null") in the Java HashMap docs.[0] All of that would immediately go away if they didn't have null. [0]: https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html https://docs.oracle.com/javase/8/docs/api/java/util/HashMap....