attr(...) public

Defines a named attribute for this module, where the name is symbol.id2name, creating an instance variable (@name) and a corresponding access method to read it. If the optional writable argument is true, also creates a method called name= to set the attribute. 

   module Mod
     attr  :size, true
   end

is equivalent to: 

   module Mod
     def size
       @size
     end
     def size=(val)
       @size = val
     end
   end
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