Make parameters required or optional later

Good day! I have a suggestion. The next code illustrates it:

class API < Grape::API
  helpers do
    params :car do
      param :name, type: String # param is a synonim for optional
      param :desc, type: String
    end
  end

  params do
    use :car
    requires :name
    optional :desc
  end
  post do
     # Create a car. Name is required.
  end

  params do
    use :car
    optional :name, :desc
  end
  put do
     # Update the car. Nothing is required.
  end
end

UPD: Another example:

params do
  param :name, type: String # param is a synonim for optional
  param :desc, type: String
end
namespace :cars do
  params do
    requires :name
  end
  post do
    # name required, not desc
  end

  put do
    # name, desc are optional
  end
end

What's your opinion? Thanks.

Review the existing parameter declaration behavior behind the examples, including how shared params are reused by POST and PUT endpoints. Clarify the intended precedence between param, requires, and optional, then add coverage for both examples; the issue does not name implementation files or tests.