I think default values are a major flaw, much worse than nil. An unintended default value causes data corruption. All types should be nillable in my opinion, us

I think default values are a major flaw, much worse than nil. An unintended default value causes data corruption. All types should be nillable in my opinion, using types that have fallback to a default value is source of nasty silent bugs. In Java for example I would never use a primitive data type.