How to solve Dry::Struct::Error <attribute> is missing in Hash input

README.md

I'm using dry-rb and dry-struct. And I wanted make some attributes optional, but I was confused with optional.

So the thing is, you can't use optional for skipping attributes. Optional means you can pass nil values, that's all.

So if you want to skip attributes, use this attribute by calling attribute?

class User < Dry::Struct
  attribute :name, Types::String
  attribute? :age, Types::Integer
end

user = User.new(name: 'Jane')
# => #<User name="Jane" age=nil>
user.age
# => nil