RecursiveGridWidget::GridWidget

we have three sizes: used (measured, in @feedback_sizes), content and element

Appends a String representation of this object which includes its class name, its object address and the values of all instance variables.

class Person
  def initialize(@name : String, @age : Int32)
  end
end

Person.new("John", 32).inspect # => #<Person:0x10fd31f20 @name="John", @age=32>

the following two are a bit ugly, but they help mainly for the demo