why constructors aren't explicit by default?

Question

It\'s so easy to forget to mark a constructor \"explicit\": adding/removing args, making them optional etc. the single reliable way I know is to declare every constructor as

Answer 1

Backward compatibility at the time when explicit was added. The language was evolving and changing meaning of existing constructs in an evolving language is a sure way to make your users angry. It is still the case now, backward compatibility is something high in the mind of the comittee.