Support for the Ruby 2.4 series has ended. See here for reference.
Object
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Returns a hash, that will be turned into a JSON object and represent this object.
 
               # File json/lib/json/add/struct.rb, line 16
def as_json(*)
  klass = self.class.name
  klass.to_s.empty? and raise JSON::JSONError, "Only named structs are supported!"
  {
    JSON.create_id => klass,
    'v'            => values,
  }
end